Computed Effect of Varying Tip Clearance and Axial Gap on Gas Turbine Stage Performance Part (I): (Steady Flow)

Wael M Elwan, Mohamed Raafat Shaalan, Mofreh M Nassief, Mohamed H. Gobran


It is desirable to further increase the efficiency of turbo-machines.  In axial flow gas turbine, imprecise axial gap and tip clearance are two significant sources of inefficiency.  This work investigates the effect of change in parameters such as axial gap and tip clearance on axial flow gas turbine used in power generation. Different combinations of axial gap and tip clearance have been tested to analyze the performance of the turbine.  It is revealed that the axial gap of 18.5% of axial chord and 2.4% tip clearance of blade height is the optimum set value for the maximum performance


Axial gap Tip clearance Efficiency Axial-Turbine

Full Text:




Dey, D., "Aerodynamic Tip Desensitization In Axial Flow Turbines", Phd, December, 2001 The Pennsylvania State University.

Da Silva, L. M., Tomita, J. T., and Barbosa, J. R., " A study Of The Influence Of The Tip-Clearance Of An Axial Turbine On The Tip-Leakage Flow Using CFDTechniques", 21st Brazilian Congress of Mechanical Engineering 2011, October ,24-28, 2011, Natal, RN, Brazil. Natal, RN, Brazil.

Gao, J., Zheng, Q., Li, Y., and Yue, G., " Effect of axially non-uniform rotor tip clearance on erodynamic performance of an unshrouded axial turbine", Journal of Power and Energy, November, 2011.

Hass. J.E, Boyle, R.J, “Analytical and Experimental Investigation Of Stator Endwall Contouring In A Small Axial-Flow Turbine”, National Aeronautics and space Administration, 1984.

Li, J., Xin, Y., Qiang L., Yonghui, X., Zhenping, F., "The Effect of the Shrouded Rotor Blade Tip Leakage Flow on the Aerodynamic Performance of a One and Half Turbine Stage", International Conference on Power Engineering October, 23-27, 2007, Hangzhou, China.

Lakshminarayana, B., Chernobrovkin, A., and Ristic, D., “Experimental and Numerical Study Of Unsteady Viscous Flow Duo To Rotor-Stator Interaction In Turbines”, 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit Jul y13-15,1998/Cleveland, OH.

PFAU, A., "Loss Mechanisms in Labyrinth Seals of Shrouded Axial Turbines", Phd, Zurich, Germany,2003.

QingJun, Z., XiYang, L., HuiShe, W., XiaoLu, Z. and JianZhong, X., " Experimental investigation on unsteady pressure fluctuation of rotor tip region in high pressure stage of a vaneless counter-rotating turbine", Science in China Series E: Technological Science, 2009, vol. 52,1478-1483.

Yadav, R., Gulati, V., and Katyal, P., “Investigations of Gas Turbine Characteristics by Varying Tip Clearance and Axial Gap”, International Journal of Engineering Research and Applications (IJERA) , Vol. 1, Issue 3, pp.1058-1064., 2008.


  • There are currently no refbacks.

Copyright © 2005-2019 Faculty of Engineering, Zagazig University