Title of article :
A Novel Design of Cooling Air Supply System with Dual Row Pre-Swirl Nozzles
Author/Authors :
Xia, Z. L Nanjing University of Aeronautics and Astronautics - China , Wang, S. F Nanjing University of Aeronautics and Astronautics - China , Zhang, J. C Aero Engine Academy of China - China
Abstract :
A novel design of cooling air supply system with dual row pre-swirl nozzles (DRPM) is promoted and
investigated. Simplified theoretical analysis and numerical simulation are used to estimate the total
temperature reduction and mass flow rate characteristic of DRPM and compared with single row pre-swirl
nozzle model (SRPM). The results show that, both models have similar flow structure and the variation of
total temperature reduction and dimensionless mass flow rate with rotational Reynolds number and pressure
ratio is also similar. Which have an inflection point with the increase of rotational Reynolds number but
increases monotonically with the variation of pressure ratio. The pre-swirl system has the maximum flow rate
and temperature reduction when the inflow Angle equal to 0 or the swirl ratio equal to 1 at the inlet of the
receiver hole. The increase in pressure ratio improves the total temperature reduction and dimensionless mass
flow rate as well. In the range of rotational Reynolds number calculated, DRPM can increase the
dimensionless mass flow rate by 3.0% but the total temperature reduction decreased by 37.8% in average
compared with SRPM. On the other hand, the dimensionless mass flow rate increased by 2.8% and total
temperature reduction decreased by 14.9% in average in the range of pressure ratio calculated. Numerical
results are in good agreement with the results calculated by simplified theoretical formulas.
Keywords :
Dual row pre-swirl nozzle , Axial pre-swirl system , Total temperature reduction , Swirl ratio , Rotor-stator cavity , Rotational Reynolds number , Pressure ratio , Dimensionless mass flow rate
