ZHANG Hao, WANG Tao, LI Yan-xi.Research on Installation Loss of Turboshaft Engine with Covert Installation Layout[J].航空发动机,2024,50(2):170-174
Research on Installation Loss of Turboshaft Engine with Covert Installation Layout
DOI:
Key Words:installation loss  turboshaft engine  flight attitude  covert installation layout  flight test
Author NameAffiliation
ZHANG Hao, WANG Tao, LI Yan-xi Chinese Flight Test EstablishmentXi’an 710089China 
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Abstract:To determine the installation performance loss of turboshaft engines required for the flight performance evaluation of light and small helicopters, flight tests were conducted on turboshaft engine with covert installation layout under different helicopter flight attitudes. Based on test flight data, a set of calculation processes of turboshaft engine installation loss under real flight conditions was established. The effects of flight attitudes such as stable level flight at different altitudes and speeds, IGE/OGE hover, IGE/OGE hover rota? tion, different altitude climb, different altitude glide, circling, and side backward flight on the installation loss of turboshaft engine were compared and analyzed. The results show that the installation loss of turboshaft engine with covert installation layout mainly comes from the inlet temperature rise; the power loss under different flight attitudes is 4.3%-20.7%, and the relative increment of specific fuel consump? tion is 1.2%-132.7%; the power loss does not change obviously with the flight altitude, but decreases with the increase of flight speed; the relative increment of specific flue consumption decreases with the increase of flight altitude and speed; the installation loss is minimized in low-speed flight attitude near the ground, and it is less affected by ground effects; wind speed and direction have a significant impact on installation losses.
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