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- W2188298937 abstract "For further improvements in efficiency and performance of gas turbines, the secondary air system, i.e. the required cooling mass flow , plays an important role. The pre-swirled secondary air supply is a common method in the aero industry and is a promising option for heavy- duty gas turbine industry to reduce the air temperature for the blade supply and disc cooling. In the experimental investigation reported here, a system with pre-swirl nozzles was run in a test rig. In the rotating system, static and total relative temperatures as well as relative pressures were measured. The disc and the receiver holes in the flow path entering the rotating system were instrumented. In the stationary system, pressures and temperatures were hooked up in the disc to casing cavities. All mass flows entering and leaving the test rig were measured by means of orifices. The effectiveness of the cooling air was measured by changing the following parameters: • disc velocity to swirl ratio • pre-swirler geometry • mass flow. The experimental data show that a significant increase of cooling air performance, i.e. reduction of total air temperature in the relative frame, can be obtained in the system investigated. The measurements of the test rig confirm that the system effectiveness is basically a function of disc velocity to swirl ratio and pre-swirler pressure ratio. The effective pre-swirler velocity depends highly on the pre-swirler design. A one dimensional model to calculate the relative pressures in the distribution holes of the rotor disc is applied to the measured data in consideration of disc friction put in the flow and a subsequent increase of total temperature. Calculated and measured pressures in the relative frame are compared." @default.
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- W2188298937 date "2007-01-01" @default.
- W2188298937 modified "2023-09-27" @default.
- W2188298937 title "Investigations of a Pre-Swirl Cooling Air Flow System with Data Acquisition in the Absolute and Relative Frame of Reference" @default.
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