Averaging Nonuniform Flow for a Purpose

2005 ◽  
Vol 128 (1) ◽  
pp. 120-129 ◽  
Author(s):  
N. A. Cumpsty ◽  
J. H. Horlock
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mass Flow ◽  
Gas Turbines ◽  
Nonuniform Flow ◽  
Flow Capacity ◽  
Crucial Feature ◽  
Blade Row ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd

Averaging nonuniform flow is important for the analysis of measurements in turbomachinery and gas turbines; more recently an important need for averaging arises with results of computational fluid dynamics (CFD). In this paper we show that there is a method for averaging which is “correct,” in the sense of preserving the essential features of the nonuniform flow, but that the type of averaging which is appropriate depends on the application considered. The crucial feature is the decision to retain or conserve those quantities which are most important in the case considered. Examples are given to demonstrate the appropriate methods to average nonuniform flows in the accounting for turbomachinery blade row performance, production of thrust in a nozzle, and mass flow capacity in a choked turbine. It is also shown that the numerical differences for different types of averaging are, in many cases, remarkably small.

Averaging Non-Uniform Flow for a Purpose

2005 ◽  
Author(s):  
N. A. Cumpsty ◽  
J. H. Horlock
Keyword(s):  
Mass Flow ◽  
Gas Turbines ◽  
Uniform Flow ◽  
Flow Capacity ◽  
Crucial Feature ◽  
Blade Row ◽  
Different Types

Averaging non-uniform flow is important for the analysis of measurements in turbomachinery and gas turbines; more recently an important need for averaging arises with results of CFD. In this paper we show that there is a method for averaging which is “correct”, in the sense of preserving the essential features of the non-uniform flow, but that the type of averaging which is appropriate depends on the application considered. The crucial feature is the decision to retain or conserve those quantities which are most important in the case considered. Examples are given to demonstrate the appropriate methods to average non-uniform flows in the accounting for turbomachinery blade row performance, production of thrust in a nozzle, and mass flow capacity in a choked turbine. It is also shown that the numerical differences for different types of averaging are, in many cases, remarkably small.

A Review of Some Early Design Practice Using Computational Fluid Dynamics and a Current Perspective

2005 ◽  
Vol 127 (1) ◽  
pp. 5-13 ◽  
Author(s):  
J. H. Horlock ◽  
J. D. Denton
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Gas Turbines ◽  
Design Practice ◽  
Future Developments ◽  
Basic Fluid ◽  
Current Perspective ◽  
Computational Fluid Dynamics Cfd ◽  
A Current ◽  
Empirical Design

In the early development of gas turbines, many empirical design rules were used; for example in obtaining fluid deflection using the deviation from blading angles, in the assumption of zero radial velocities (so-called radial equilibrium) and in expressions for clearance loss (the Lakshminarayana formulas). The validity of some of these rules, and the basic fluid mechanics behind them, is examined by use of modern ideas and computational fluid dynamics (CFD) codes. A current perspective of CFD in design is given, together with a view on future developments.

scholarly journals Aerodynamic performance of X-plane with two different types of inboard stores

2018 ◽  
Vol 7 (4.13) ◽  
pp. 202-204
Author(s):  
Mahadhir A Rahman ◽  
Mohammad Yazdi Harmin ◽  
Mohd Fuad Koslan ◽  
Mohd Rashdan Saad ◽  
Mohd Faisal Abdul Hamid
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Aerodynamic Performance ◽  
Cfd Analysis ◽  
Aircraft Model ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd

This paper presents the investigation of aerodynamic performance of inboard Store-X and Store-Y configurations on the X-plane aircraft model through computational fluid dynamics (CFD) analysis. The X-plane and Store-Y represent the default store and pylon integration while Store-X provides a possibility for other types of store to be integrated. These stores are loosely based upon the two most commonly used by the western and eastern blocks. The resultant lift, drag and moment forces are of interest in order to observe their impact with respect to the two different stores configurations. The finding shows that the aerodynamic impact with respect to Store-X installation on the inboard pylon station is insignificant when compared to default system, hence offers the safety of delivering the Store-X from the X-plane aircraft.

Numerical Study of Micromixers for Stopped Flow

2011 ◽  
Author(s):  
Dominik Du¨chs ◽  
Sabine Brunklaus ◽  
Peter Spang ◽  
Marion Ritzi-Lehnert ◽  
Klaus Drese
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Potential Application ◽  
Numerical Study ◽  
Stopped Flow ◽  
Microfluidic Chips ◽  
Cfd Simulations ◽  
Mixing Parameter ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd

Computational fluid dynamics (CFD) simulations are conducted to compare the efficiency of different types of micromixers with respect to their potential application in chip-based stopped-flow designs. The evaluation of a mixing parameter for different geometries and at various flow velocities enables a comparison between the Berger ball mixer and other designs that are in principle suitable for applications in microfluidic chips.

scholarly journals Stepping Up CFD

2002 ◽  
Vol 124 (04) ◽  
pp. 47-49
Author(s):  
Jean Thilmany
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Research And Development ◽  
Computational Method ◽  
Environmental Research ◽  
Erosion Model ◽  
Suitable Material ◽  
The Past ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd

This article highlights that computational fluid dynamics (CFD) software has become a widely used tool in engineering, biomedical, and environmental research and development in the past few years. CFD might be coupled with multiphysical applications, so users can solve for more than one phenomenon at a time. CFD methods can predict the areas of a component that will see the most damage from the sand, The CFD-based erosion model let the component manufacturer predict the areas of highest erosion and take steps to either reinforce those areas with a suitable material or else redesign the component. CFD will be used even more widely across disciplines and different types of technologies than it is now, but the computational method is already invaluable to many engineers working with varied, unrelated applications.

scholarly journals Modelling of clinker cooler and evaluation of its performance in clinker cooling process for cement plants

2021 ◽  
Vol 39 (4) ◽  
pp. 1093-1099
Author(s):  
J.S. Oyepata ◽  
M.A. Akintunde ◽  
O.A. Dahunsi ◽  
S.S. Yaru ◽  
E.T. Idowu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Mass Flow ◽  
Cooling System ◽  
Outlet Temperature ◽  
Theoretical Evaluation ◽  
Computational Fluid Dynamics Cfd ◽  
Solid Works ◽  
Cooling Air Flow ◽  
Cement Manufacturing

Cement manufacturing requires cooling down of hot clinker at temperature of about 1350o C to temperature lower than 100 o C in a cooling system known as clinker cooler. Many plants are unable to cool the clinker below 250o C. This challenge led to scaling down of actual clinker cooler to a test rig size in the ratio 25:1 suitable for simulation. Computational Fluid Dynamics (CFD) tools (Solid-Works and ANSYS) were used to achieve the simulation. The clinker outlet temperatures obtained from simulations were validated with theoretical evaluation. Results showed that with clinker and cooling air flow rates of 0.2 kg/s and 0.54 kg/s respectively and with a clinker bed height of 0.6 m. An optimum cooler performance was achieved with clinker outlet temperature of 68 oC. The scaled down cooler was 15% higher than the existing cooler in terms of recoverable energy and 10% high in terms of energy efficiency. Keywords: Clinker Cooler, Computational Fluid Dynamics (CFD), Mass flow rate clinker and Mass flow air and Clinker Furnace.

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