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运用标准k-ε湍流模型对不同吹风比下正菱形、长菱形和超长菱形三种气膜孔阵列方式的多孔全覆盖气膜冷却的气膜出流流场特性、气膜绝热冷却效率和气膜综合冷却效率进行了数值模拟对比研究.结果表明:气膜孔阵列超长菱形排布是较优的排布方案,在该排布方式下,气膜出流向主流的穿透相对较弱,气膜沿展向的覆盖率也较高,因而气膜绝热冷却效率相对最高;气膜孔排布方式对气膜综合冷却效率的影响规律与气膜绝热冷却效率的基本一致,超长菱形排布仍然是较优的排布方案.
The standard k-ε turbulence model was used to simulate the flow field characteristics of the gas-film flow and the gas-film adiabatic cooling efficiency and the gas-gas barrier performance of the gas-membrane coalesced by the three kinds of gas-hole arrays with rhombic, rhomboidal and extra- The results show that the long rhombus arrangement of film hole array is an optimal arrangement scheme. Under this arrangement, the infiltration of outflow from the film to the mainstream is relatively weak, The coverage ratio of the gas film along the exhibition direction is also higher, so the adiabatic cooling efficiency of the gas film is the highest; the influence law of the gas film hole arrangement mode on the overall gas cooling efficiency is basically the same as the adiabatic cooling efficiency of the gas film, Cloth is still a better arrangement.