| Popis: |
An analytical model of a far acoustic gas-turbine engine (GTE) fan field affording an acceptable accuracy for practical calculations in a broad band of bypass ratio variation has been proposed. The model was developed on the basis of theoretical and physical insight into blade machine noise formation mechanism, familiar calculation techniques, and acoustic velocity data base of aircraft gas-turbine engines obtained under acoustical bench tests of PC-90A, SaM-146, D-36, D-30 KU, etc. engines. Herewith a fan is considered as a part of gas-turbine engine system. Basic methods of fan noise reduction have been offered. |
