Impact of Secondary Flow on the Accuracy of Simplified Design Methods for Steam Turbine Stages

2012 ◽  
Author(s):  
Jan Schumann ◽  
Ulrich Harbecke ◽  
Daniel Sahnen ◽  
Thomas Polklas ◽  
Peter Jeschke ◽  
...  
Keyword(s):  
Secondary Flow ◽  
Steam Turbine ◽  
Design Process ◽  
Design Method ◽  
Computing Time ◽  
Leading Edge ◽  
Design Methods ◽  
Preliminary Design ◽  
Line Design ◽  
Radial Equilibrium

The subject of the presented paper is the validation of a design method for HP and IP steam turbine stages. Common design processes have been operating with simplified design methods in order to quickly obtain feasible stage designs. Therefore, inaccuracies due to assumptions in the underlying methods have to be accepted. The focus of this work is to quantify the inaccuracy of a simplified design method compared to 3D Computational Fluid Dynamics (CFD) simulations. Short computing time is very convenient in preliminary design; therefore, common design methods work with a large degree of simplification. The origin of the presented analysis is a mean line design process, dealing with repeating stage conditions. Two features of the preliminary design are the stage efficiency, based on loss correlations, and the mechanical strength, obtained by using the beam theory. Due to these simplifications, only a few input parameters are necessary to define the primal stage geometry and hence, the optimal design can easily be found. In addition, by using an implemented law to take the radial equilibrium into account, the appropriate twist of the blading can be defined. However, in comparison to the real radial distribution of flow angles, this method implies inaccuracies, especially in regions of secondary flow. In these regions, twisted blades, developed by using the simplified radial equilibrium, will be exposed to a three-dimensional flow, which is not considered in the design process. The analyzed design cases show that discrepancies at the hub and shroud section do exist, but have minor effects. Even the shroud section, with its thinner leading-edge, is not vulnerable to these unanticipated flow angles.

scholarly journals Parametric Geometry and CFD Process for Turbofan Nacelles

2016 ◽  
Author(s):  
Alexander Heidebrecht ◽  
Tomasz Stańkowski ◽  
David MacManus
Keyword(s):  
Design Space ◽  
Design Method ◽  
Design Methods ◽  
Fluid Simulation ◽  
Preliminary Design ◽  
Shape Transformation ◽  
Simulation Process ◽  
Aerodynamic Properties ◽  
Commercial Code ◽  
Expected Performance

A parametric geometry definition for a generic turbofan nacelle was developed for use in preliminary design, based on Class-Shape Transformation curves. This takes as input a set of six intuitive variables which describe the main dimensions of a nacelle. This set is the same set of inputs as required by a preliminary nacelle design method to which the aerodynamic properties of resulting shapes were compared. An automated computational fluid simulation process was developed and implemented which generates meshes and quickly conducts an analysis of the resulting nacelle shapes using a commercial code. Several geometries were generated and analysed using this process to show whether the aerodynamic properties of the generated shapes are in line with the expected performance of a fan cowl of equal dimensions. It was found that the aerodynamic performance of the parametric fan cowls significantly exceeds predictions from an established preliminary fan cowl design method and is very close in performance to existing designs. The drag of an equivalent parametric fan cowl can therefore be used as a predictor of nacelle performance with greater accuracy than established preliminary design methods. It is therefore suited as a tool to develop improved preliminary design methods, and for studies of the design space for preliminary nacelle design.

scholarly journals Efektifitas Metode Eksplorasi Konsep dalam Studio Perancangan Arsitektur Tematik Bagi Mahasiswa Studi Kasus: Universitas Merdeka Surabaya

Arsitektura ◽  
2019 ◽  
Vol 17 (2) ◽  
pp. 249
Author(s):  
Vijar Galax Putra Jagat Paryoko
Keyword(s):  
Design Process ◽  
Undergraduate Students ◽  
Architectural Design ◽  
Design Method ◽  
Design Methods ◽  
Design Theories ◽  
Design Skills

<p class="Abstract"><em>Study in thematic architectural design studios for undergraduate students requires the participants to be able to convey the image and the meaning behind it through architectural design. Skills on comprehensive design process and utilization of appropriate methods are determine the success on implementing architectural meanings through design theme. This research aims to find exploring ideas methods which are effective be </em><em>used to</em><em> for generate thematic concepts. The research uses qualitative strategies to examine the processes and products outcomes of studio participant’s study that are controlled through design theories which studied by them. It was concluded that analogic design method is an effective category to be used, both analogy by sources inside architecture field and outside. Both analogy of form, meaning, and image. In addition, the level of diversity and depth understanding of design methods also influence the success of architectural design by themes.</em></p>

scholarly journals The influence of design methodology on a designer's emotional parameters and on design results

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 106-112 ◽  
Author(s):  
Vicente Chulvi ◽  
Mª Carmen González-Cruz
Keyword(s):  
Design Process ◽  
Emotional Response ◽  
Design Methodology ◽  
Design Method ◽  
Design Methods ◽  
Direct Relation ◽  
Design Problems ◽  
Direct Association ◽  
Recorded Data

<p>This paper presents the results of an experiment carried out on 21 subjects, all of whom had an engineering background, with the aim of determining the influence of the designer’s attitude on the design process and on the finished design. The participants were asked to solve a range of design problems by employing different methods while their emotional response parameters were being registered by a noninvasive neuroheadset. The recorded data was used firstly to compare the different reactions of the subjects when using different design methods. A second analysis was carried out to determine whether the variations in the emotional parameters bore any direct relation to the creativity of the outcomes. The results obtained indicate a relation between emotional parameters, individuals and the design method used. However, there does not appear to be any direct association between emotional parameters and the creativity of the results.</p>

scholarly journals Design for additive manufacturing – a review of available design methods and software

2019 ◽  
Vol 25 (6) ◽  
pp. 1080-1094 ◽  
Author(s):  
Anton Wiberg ◽  
Johan Persson ◽  
Johan Ölvander
Keyword(s):  
Additive Manufacturing ◽  
Design Process ◽  
Design Automation ◽  
Design Method ◽  
Design Methods ◽  
Component Part ◽  
Design For Additive Manufacturing ◽  
Content Type ◽  
Future Design ◽  
Research Areas

Purpose This paper aims to review recent research in design for additive manufacturing (DfAM), including additive manufacturing (AM) terminology, trends, methods, classification of DfAM methods and software. The focus is on the design engineer’s role in the DfAM process and includes which design methods and tools exist to aid the design process. This includes methods, guidelines and software to achieve design optimization and in further steps to increase the level of design automation for metal AM techniques. The research has a special interest in structural optimization and the coupling between topology optimization and AM. Design/methodology/approach The method used in the review consists of six rounds in which literature was sequentially collected, sorted and removed. Full presentation of the method used could be found in the paper. Findings Existing DfAM research has been divided into three main groups – component, part and process design – and based on the review of existing DfAM methods, a proposal for a DfAM process has been compiled. Design support suitable for use by design engineers is linked to each step in the compiled DfAM process. Finally, the review suggests a possible new DfAM process that allows a higher degree of design automation than today’s process. Furthermore, research areas that need to be further developed to achieve this framework are pointed out. Originality/value The review maps existing research in design for additive manufacturing and compiles a proposed design method. For each step in the proposed method, existing methods and software are coupled. This type of overall methodology with connecting methods and software did not exist before. The work also contributes with a discussion regarding future design process and automation.

Verifying the Usability of Failure-Based Computational Design Methods

2010 ◽  
Author(s):  
Sarah Oman ◽  
Michael Koch ◽  
Irem Y. Tumer ◽  
Matt Bohm
Keyword(s):  
Design Process ◽  
Early Stage ◽  
Design Method ◽  
Computational Design ◽  
Design Methods ◽  
Safety Measures ◽  
History Of ◽  
Assessment Techniques ◽  
Functional Representations ◽  
Verification Methodology

In the early stages of the design process, there is a need to provide designers with tools to assess risks and possible failures so as to avoid costly redesigns, comply with established safety measures and to promote innovation throughout the design process. Recently, various methods have been proposed in research to accomplish such tasks, including the Risk in Early Design (RED) and the Function Failure Design Method (FFDM). This paper proposes a method for examining the utility of such failure-based computational design methods. Validation is accomplished by analyzing products with a known history of failure, decomposing these products into functional representations and performing both RED and FFDM analyses on these models to see how closely such methods are able to correctly identify the real-world failures. The goal of this work is to determine the effectiveness of both the RED and FFDM methods in order to suggest improvements for both methods. The results provide insight on the verification methodology in addition providing to prescriptive methods to increase the usefulness of early stage failure and risk assessment techniques.

scholarly journals Research on Innovative Design Method Based on TRIZ——Taking the Elderly-Oriented Transformation of Outdoor Seats as an Example

2020 ◽  
Vol 179 ◽  
pp. 02003
Author(s):  
Zhang Peng ◽  
Haiyong Shen ◽  
Yang Tao
Keyword(s):  
Design Process ◽  
Design Method ◽  
The Elderly ◽  
Preliminary Design ◽  
Analysis Model ◽  
Innovative Design ◽  
Innovation Model ◽  
New Ideas ◽  
Design Plan ◽  
Time Required

This article takes the aging modification of outdoor seats as an example to analyze and discuss the application of TRIZ in the innovative design process. According to this method, the analysis model is constructed and imported into TRIZ tool for solutions, and finally a preliminary design plan and a series of optimization plans are quickly obtained, after analysis and comparison, the final plan was determined, which verified the obvious advantages of the comprehensive application method of TRIZ and innovative design. It can effectively break the mindset, improve the quality and innovation of the design, provide a more efficient and systematic innovation model for the design, and greatly shorten the time required for the design process, combined with the current situation and trend of aging in China, it also provides new theories, new ideas, and new perspectives for future suitable aging design.

Assessment of the Relationships Among Design Methods, Design Activities, and Creativity

2012 ◽  
Vol 134 (11) ◽  
Author(s):  
Vicente Chulvi ◽  
Águeda Sonseca ◽  
Elena Mulet ◽  
Amaresh Chakrabarti
Keyword(s):  
Experimental Study ◽  
Functional Analysis ◽  
Design Process ◽  
Design Method ◽  
Design Methods ◽  
Design Phase ◽  
Design Processes ◽  
Different Types ◽  
Design Activities

This paper presents an experimental study that was conducted to compare the results obtained from using different design methods (brainstorming (BR), functional analysis (FA), and SCAMPER) in design processes. The objectives of this work are twofold. The first was to determine whether there are any differences in the length of time devoted to the different types of activities that are carried out in the design process, depending on the method that is employed; in other words, whether the design methods that are used make a difference in the profile of time spent across the design activities. The second objective was to analyze whether there is any kind of relationship between the time spent on design process activities and the degree of creativity in the solutions that are obtained. Creativity evaluation has been done by means of the degree of novelty and the level of resolution of the designed solutions using creative product semantic scale (CPSS) questionnaire. The results show that there are significant differences between the amounts of time devoted to activities related to understanding the problem and the typology of the design method, intuitive or logical, that are used. While the amount of time spent on analyzing the problem is very small in intuitive methods, such as brainstorming and SCAMPER (around 8–9% of the time), with logical methods like functional analysis practically half the time is devoted to analyzing the problem. Also, it has been found that the amount of time spent in each design phase has an influence on the results in terms of creativity, but results are not enough strong to define in which measure are they affected. This paper offers new data and results on the distinct benefits to be obtained from applying design methods.

Development of the design method for the optimal design of the Neutron Converter experimental plant

2020 ◽  
Author(s):  
Timur Smetani ◽  
Elizaveta Gureva ◽  
Vyacheslav Andreev ◽  
Natalya Tarasova ◽  
Nikolai Andree
Keyword(s):  
Optimal Design ◽  
Flux Density ◽  
Design Process ◽  
Design Method ◽  
Fast Neutrons ◽  
Experimental Plant ◽  
Plant Design ◽  
State Technical ◽  
Research Organizations ◽  
Neutron Converter

The article discusses methods for optimizing the design of the Neutron Converter research plant design with parameters that are most suitable for a particular consumer. 38 similar plant structures with different materials and sources were calculated, on the basis of which the most optimal options were found. As part of the interaction between OKBM Afrikantov JSC and the Nizhny Novgorod State Technical University named after R. E. Alekseev, the Neutron Converter research plant was designed and assembled. The universal neutron converter is a device for converting a stream of fast neutrons emitted by isotopic sources into a "standardized" value of flux density with known parameters in the volume of the central part of the product, which is the working part of the universal neutron converter. To supply neutron converters to other customer organizations (universities, research organizations and collective centers), it is necessary to take into account the experience of operating an existing facility, as well as rationalize the design process of each specific instance in accordance with the requirements of the customer.

An Update on Improved Flange Design Methods

2007 ◽  
Author(s):  
Warren Brown
Keyword(s):  
Design Method ◽  
Design Methods ◽  
Project Development ◽  
Design Improvement ◽  
Panel Session ◽  
Improved Methods ◽  
Made In

This paper details further progress made in the PVRC project “Development of Improved Flange Design Method for the ASME VIII, Div.2 Rewrite Project” presented during the panel session on flange design at the 2006 PVP conference in Vancouver. The major areas of flange design improvement indicated by that project are examined and the suggested solutions for implementing the improved methods into the Code are discussed. Further analysis on aspects such as gasket creep and the use of leakage-based design has been conducted. Shortcomings in the proposed ASME flange design method (ASME BFJ) and current CEN flange design methods (EN-1591) are highlighted and methods for resolution of these issues are suggested.

scholarly journals Design of a Variable-Stiffness Compliant Skin for a Morphing Leading Edge

2021 ◽  
Vol 11 (7) ◽  
pp. 3165
Author(s):  
Zhigang Wang ◽  
Yu Yang
Keyword(s):  
Composite Laminate ◽  
Large Scale ◽  
Design Method ◽  
Leading Edge ◽  
Variable Stiffness ◽  
Manufacturing Constraints ◽  
Aircraft Wing ◽  
Noise Abatement ◽  
Civil Aircraft ◽  
Final Profile

A seamless and smooth morphing leading edge has remarkable potential for noise abatement and drag reduction of civil aircraft. Variable-stiffness compliant skin based on tailored composite laminate is a concept with great potential for morphing leading edge, but the currently proposed methods have difficulty in taking the manufacturing constraints or layup sequence into account during the optimization process. This paper proposes an innovative two-step design method for a variable-stiffness compliant skin of a morphing leading edge, which includes layup optimization and layup adjustment. The combination of these two steps can not only improve the deformation accuracy of the final profile of the compliant skin but also easily and effectively determine the layup sequence of the composite layup. With the design framework, an optimization model is created for a variable-stiffness compliant skin, and an adjustment method for its layups is presented. Finally, the deformed profiles between the directly optimized layups and the adjusted ones are compared to verify its morphing ability and accuracy. The final results demonstrate that the obtained deforming ability and accuracy are suitable for a large-scale aircraft wing.

Sign in / Sign up

Export Citation Format

Share Document