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A novel design of cooling air supply system with dual row pre-swirl nozzles
Author(s): ZiLong Xia, S. F. Wang, Jian Chao Zhang
Keywords: Dual row pre-swirl nozzle, Axial pre-swirl system, Temperature reduce, Swirl ratio, Rotor-stator cavity, Rotational Reynolds number, Pressure ratio, Dimensionless mass flow rate
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 reduce 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 variable trends of total temperature reduce and dimensionless mass flow rate, all increases then decreases with the increases of rotational Reynolds number and increase with the increases of pressure ratio. Pre-swirl system reaches 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 receiver hole. The increase of pressure ratio improve the total temperature reduce and dimensionless mass flow rate as well. DRPM can improve the dimensionless mass flow by 3.0% in the range of rotational Reynolds number and 2.8% in the range of pressure ratio compared with SRPM but total temperature reduce decreased by 37.8 % in the range of rotational Reynolds number and 14.9 % in the range of pressure ratio on the other hand. The results obtained from simplified theoretical equations were, in the main, in good agreement with the CFD results, total temperature reduce in DRPM can reach a similar level of SRPM and a higher mass flow rate if the radial location of dual row pre-swirl nozzles and the mass flow distribution ratio are arranged appropriately.