Optimal Design and Steady-state Characteristic Analysis of High Speed S-CO2 Axial Turbine Blades

2019 ◽  
Author(s):  
Di Peng ◽  
Chengqing Yuan ◽  
Yuwei Sun
Keyword(s):  
Steady State ◽  
Optimal Design ◽  
High Speed ◽  
Turbine Blades ◽  
State Characteristic ◽  
Characteristic Analysis ◽  
Axial Turbine

Methods and Tools for Multidisciplinary Optimization of Axial Turbine Stages With Relatively Long Blades

2004 ◽  
Author(s):  
Leonid Moroz ◽  
Yuri Govoruschenko ◽  
Leonid Romanenko ◽  
Petr Pagur
Keyword(s):  
Optimal Design ◽  
Turbine Blades ◽  
Multidisciplinary Optimization ◽  
Stress Strain ◽  
Axial Turbine ◽  
Maximal Efficiency ◽  
Vibration Reliability ◽  
Technological Limitations

An effective methodology for optimal design of axial turbine blades is presented. It has been used for achieving stage maximal efficiency meeting both stress-strain and vibration reliability requirements and taking into account technological limitations.

Three-Dimensional Aerodynamic Design of Turbine Blades Using the Adjoint Method

2008 ◽  
Author(s):  
Yingchen Li ◽  
Zhenping Feng
Keyword(s):  
Boundary Conditions ◽  
Adjoint Method ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Adjoint Equations ◽  
Aerodynamic Design ◽  
Characteristic Analysis ◽  
Axial Turbine ◽  
B Spline ◽  
Continuous Adjoint

The adjoint method is attractive because of its low computational cost and high efficiency. Although it has been one of the hot issues in aerodynamic design, it is not so widely used in turbomachinery applications as it is in the aeronautical field. The purpose of this work is to apply the adjoint method to three-dimensional (3D) aerodynamic inverse design of axial turbine blades for inviscid compressible flow. The 3D continuous adjoint system of Euler equations is formulated for turbine internal flow. The 3D blade profile is parameterized with Non-uniform B-Spline patch, and the coordinates of the B-Spline control points are selected as the design variables. Characteristic analysis of adjoint equations is taken to set inlet/outlet boundary conditions. To avoid the discontinuity of boundary conditions of adjoint equations in the spanwise direction, a method for solving an ordinary differential equation is developed to smooth the residual distribution of aerodynamic parameter on blade surface. 3D adjoint equations are numerically solved by using time-marching method and finite volume method. Finally, combining the grid perturbation technique, CFD technique and quasi-Newton algorithm, the aerodynamic design approach for 3D axial turbine blades is presented and several numerical examples are demonstrated to validate this approach.

scholarly journals The Steady-State Characteristic Analysis of 2MW PMSG based Direct-Drive Offshore Wind Turbine

2015 ◽  
Vol 35 (3) ◽  
pp. 9-16
Author(s):  
Pyungho Shin ◽  
Jungchul Choi ◽  
Chul Yoo ◽  
Daejin Kim ◽  
Namho Kyong ◽  
...  
Keyword(s):  
Steady State ◽  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Direct Drive ◽  
State Characteristic ◽  
Characteristic Analysis

Crack divergence phenomena in tempered glass

2020 ◽  
Vol 13 (3) ◽  
pp. 115-129
Author(s):  
Shin’ichi Aratani
Keyword(s):  
Optimal Design ◽  
High Speed ◽  
Glass Plate ◽  
Acute Angle ◽  
Divergence Angle ◽  
High Speed Photography ◽  
Tempered Glass ◽  
Thick Glass

High speed photography using the Cranz-Schardin camera was performed to study the crack divergence and divergence angle in thermally tempered glass. A tempered 3.5 mm thick glass plate was used as a specimen. It was shown that two types of bifurcation and branching existed as the crack divergence. The divergence angle was smaller than the value calculated from the principle of optimal design and showed an acute angle.

scholarly journals Design and thermal characteristic analysis of motorized spindle cooling system

2021 ◽  
Vol 13 (5) ◽  
pp. 168781402110208
Author(s):  
Yuan Zhang ◽  
Lifeng Wang ◽  
Yaodong Zhang ◽  
Yongde Zhang
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Thermal Deformation ◽  
Cooling System ◽  
Thermal Characteristic ◽  
Water Flow Rate ◽  
Thermal Characteristics ◽  
Characteristic Analysis ◽  
Motorized Spindle ◽  
Experiment And Simulation

The thermal deformation of high-speed motorized spindle will affect its reliability, so fully considering its thermal characteristics is the premise of optimal design. In order to study the thermal characteristics of high-speed motorized spindles, a coupled model of thermal-flow-structure was established. Through experiment and simulation, the thermal characteristics of spiral cooling motorized spindle are studied, and the U-shaped cooled motorized spindle is designed and optimized. The simulation results show that when the diameter of the cooling channel is 7 mm, the temperature of the spiral cooling system is lower than that of the U-shaped cooling system, but the radial thermal deformation is greater than that of the U-shaped cooling system. As the increase of the channel diameter of U-shaped cooling system, the temperature and radial thermal deformation decrease. When the diameter is 10 mm, the temperature and radial thermal deformation are lower than the spiral cooling system. And as the flow rate increases, the temperature and radial thermal deformation gradually decrease, which provides a basis for a reasonable choice of water flow rate. The maximum error between experiment and simulation is 2°C, and the error is small, which verifies the accuracy and lays the foundation for future research.

Auto and Cross Correlation Measurements in a Turbine Cascade Using a Digital Correlator

1982 ◽  
Author(s):  
P. J. Bryanston-Cross ◽  
J. J. Camus
Keyword(s):  
Mach Number ◽  
High Speed ◽  
Cross Correlation ◽  
Turbine Blades ◽  
Image Plane ◽  
Strongly Correlated ◽  
Trailing Edge ◽  
Number Range ◽  
Cross Correlations ◽  
Digital Correlator

A simple technique has been developed which samples the dynamic image plane information of a schlieren system using a digital correlator. Measurements have been made in the passages and in the wakes of transonic turbine blades in a linear cascade. The wind tunnel runs continuously and has independently variable Reynolds and Mach number. As expected, strongly correlated vortices were found in the wake and trailing edge region at 50 KHz. Although these are strongly coherent we show that there is only limited cross-correlation from wake to wake over a Mach no. range M = 0.5 to 1.25 and variation of Reynolds number from 3 × 105 to 106. The trailing edge fluctuation cross correlations were extended both upstream and downstream and preliminary measurements indicate that this technique can be used to obtain information on wake velocity. The vortex frequency has also been measured over the same Mach number range for two different cascades. The results have been compared with high speed schlieren photographs.

Development of High-Speed Response Electromagnetic Linear Actuator Using for Pneumatic Control Valve

2014 ◽  
Vol 532 ◽  
pp. 41-45 ◽  
Author(s):  
Myung Jin Chung
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Design Method ◽  
Control Valve ◽  
Design Parameters ◽  
Linear Actuator ◽  
Analytic Model ◽  
Electromagnetic Linear Actuator ◽  
Quadratic Programming Method

Analytic model of electromagnetic linear actuator in the function of electric and geometric parameters is proposed and the effects of the design parameters on the dynamic characteristics are analyzed. To improve the dynamic characteristics, optimal design is conducted by applying sequential quadratic programming method to the analytic model. This optimal design method aims to minimize the response time and maximize force efficiency. By this procedure, electromagnetic linear actuator having high-speed characteristics is developed.

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