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Flow analysis of combined impingement and film cooled gas turbine nozzle guide vane

机译：冲击和薄膜冷却燃气轮机喷嘴导叶组合的流动分析

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In the present study, a typical nozzle guide vane (NGV) is considered with twenty six rows of impingement holes combined with thirteen rows of film cooled rows for the flow analysis. The coolant mass flow variations in different rows of the film holes externally subjected to the hot main stream are obtained by making a three dimensional computational analysis of NGV. The analysis is performed with the help of Fluent software. Attempts were made to study the effect of two parameters: (i) inlet coolant mass flow rate and (ii) external flow Reynolds number for a typically cooled NGV. Detailed coolant flow mass flow rate, pressure drop and temperature distributions are presented with an array of multiple jets impinging on a gas turbine high pressure NGV with a staggered array of film cooled rows. Results are presented for three laboratory test cases by varying flow rates for FIT and AIT. Coolant flow rate values at each row of film hole are compared among these test cases. The each row of a film hole is noticed with coolant mass flow rate, pressure drop and temperature rise across the hole found to increase with increase of coolant supply conditions at the two plenums. Owing to the interaction between hot main stream and the coolant that effuses out of the film holes, occasional presence of hot gas ingestion is noticed for certain flow rates. This causes nonlinear distribution in mass flow, pressure drop and temperature rise. These behaviors suggest a possibility of locally optimized solutions for a combination of coolant mass flow and mainstream Reynolds number.
机译：在本研究中，考虑了典型的喷嘴导流叶片（NGV），其中有26行冲击孔与13行薄膜冷却行结合在一起进行流动分析。通过对NGV进行三维计算分析，可以得出外部受热主流影响的薄膜孔不同行中的冷却剂质量流量变化。该分析是在Fluent软件的帮助下进行的。试图研究两个参数的影响：（i）进口冷却剂质量流速和（ii）典型冷却的NGV的外部流雷诺数。详细的冷却剂流量，流速，压降和温度分布是通过一排多列射流撞击在燃气轮机高压NGV上形成的，这些射流错开排列成排的薄膜冷却行。通过改变FIT和AIT的流速，给出了三个实验室测试用例的结果。在这些测试案例中，比较了薄膜孔每行的冷却剂流速值。注意到薄膜孔的每一行都有冷却剂质量流量，整个孔上的压降和温度升高，这随在两个气室中冷却剂供应条件的增加而增加。由于热的主流和流出薄膜孔的冷却剂之间的相互作用，在某些流速下偶尔会出现热气体的摄入。这会导致质量流量，压力下降和温度上升的非线性分布。这些行为表明，针对冷却剂质量流量和主流雷诺数的组合，可能会进行局部优化的解决方案。

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