Session: 15-02 Swirling Flow / Swirl Chambers

Paper Number: 79594

79594 - Jet Entrance Configurations and Swirl Motion Effects on Heat Transfer Characteristics Inside Blade Leading Edge of the Gas Turbine 

In the present work a simulation is conducted by CFD to predict the cooling performance in a
chamber with a swirl motion using nine shapes of injection entrances. The injection entrances
are with different cross sections; rectangular (case A), circular (case B), half circular (case C),
square (case D), elliptical (case E), equilateral triangular (case F) and three configurations of
convergent shapes (case G, H, I). The simulation is performed at constant hydraulic diameter
for all shapes and at varied Reynolds number. The investigation parameters are temperature
distribution in swirl chamber, circumferential and total velocities, circumferential and axially
averaged Nusselt numbers, friction factor and thermal performance parameter. The results
show that the coolant fluid absorbs more heat using all entrance shapes compared to the
reference case. The high circumferential velocity is achieved through the circular entrance
shape. The circumferential average Nusselt number from case I to the reference case (case A)
is 3.3 times. The convergent entrance shapes give high heat transfer performance, at Re=
12500 the global Nu of the case I to the global Nu of reference the case is 2.1 times. The
friction factor of case I is a highest, while the friction factor of circular entrance shape (case B)
is decreased by 0.3% compared to the reference case. Convergent entrance shapes have the
lowest thermal performance parameters, the thermal performance factor of the case I is lower
than the reference case of about 88%.

Presenting Author: Qun Zheng Harbin Engineering University

Presenting Author Biography: Professor: Qun Zheng<br/>Harbin Engineering University, Harbin 150001, China<br/>zhengqun@hrbeu.edu.cn<br/>Phone:13199557181

Authors:

Fifi Elwekeel Helwan University
Qun Zheng Harbin Engineering University
Antar Abdala Helwan University