Abstract
The variable guide vanes (VGV) of gas turbine engines are commonly utilized to expand operating range and to improve efficiency of the compressor. Guiding air flow using the VGVs in the compressor prevents aerodynamic instability by making proper incidence angle to the blades. In this study, we dealt with rig-type three-stages VGVs for developed engine tests. The three link mechanism of VGVs are linked to each other with two hydraulic actuators, and inevitably, induced hysteresis exists between vane rotations and actuators strokes, due to links with non-fully constrained degree of freedoms for easy installation and instrumentation, as well. Therefore, the adjustment of each VGVs link mechanism is required to satisfy vane angle demands. To adjust coupled three-stages VGVs link mechanism, an analytical VGV-link kinematic model was derived, and effects of two adjusting parameters (lengths of bell cranks and vertical links) were discovered. Lastly, we obtained two vane angle schedule curves from the experiments according to link moving directions, and applied them to the engine controller to minimize hysteresis of the variable inlet guide vane (VIGV). The proposed VGV adjusting and controlling method can be simply applied to the pre-designed or pre-manufactured VGVs system without mechanical compensation or additional cost.
Highlights
Aerodynamic stability should be assured for the compressor of an aircraft gas-turbine engine, at the operating design point, and at off-design points, due to its wide operating range with frequent acceleration and deceleration
Variable guide vanes (VGVs) are generally utilized to obtain stability of the compressor over a wide operating range and the stator vanes of variable guide vanes (VGV) change their angles according to the inlet air-flow, which varies with the engine RPM [1,2]
The VGV link mechanism is usually composed of complex link connections, it is, difficult to be modeled
Summary
Aerodynamic stability should be assured for the compressor of an aircraft gas-turbine engine, at the operating design point, and at off-design points, due to its wide operating range with frequent acceleration and deceleration. VGV system has unique link mechanism with three stages of testing gas-turbine engines. 1. Threemanipulated by vertical links of the link mechanisms, and extension/compression of the hydraulic stage VGVs are connected to the each unison rings through lever arms, and the lever arms and vanes actuators induce bellrotates cranksabout and vertical movement of the vertical links. Enough space common the rotational of the unisonwas rings of threeby stages coupled each betweenbell thecrank, compressor and themotions hydraulic actuators obtained using longare vertical links for other, each motion can beand characterized by lengths of their easy and installation of sensors other components during the links.
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