Numerical simulation of mixing characteristic of rear variable area bypass injector with lobed structure
In order to improve the mixing efficiency of the air flow between the inner and outer bypasses of the rear variable area bypass injector(RVABI)in the variable cycle engine,and to improve the velocity uniformity between the mixed air flows,a method of adjusting the outer bypass area of the RVABI with lobed structure was proposed.By means of numerical simulation,the total pressure loss,thermal mixing efficiency,velocity distribution and vortex evolution were studied and analyzed,and the two reference models were compared.The results showed that the method of adjusting the outer bypass area of the variable area bypass injector by introducing the lobed structure can significantly improve the uniformity of the flow field velocity and greatly improve the thermal mixing efficiency of the inner and outer bypasses.And with the increase of the bypass ratio,compared with the reference configuration band,the thermal mixing efficiency of the area adjustment method of the lobed structure was improved more significantly.The mixing degree depended on the scale and influence range of the flow vortex;the lobed shape and corresponding area can be optimized synchronously to further improve the regulating performance.
variable cycle enginerear variable area bypass injector(RVABI)outer bypass area regulatorlobed mixerstreamwise vortexbypass ratio
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