極限條件下的大角度擴(kuò)散段優(yōu)化設(shè)計(jì)數(shù)值模擬
[Abstract]:In order to improve the static pressure recovery performance of a large angle diffusion section in a low speed wind tunnel and to reduce the total pressure loss to the level of shunt separator, the different design schemes of the diffusion section were simulated by computational fluid dynamics (CFD) method. The separation can be effectively restrained by using damping mesh. The location of damping mesh and the opening rate have great influence on the flow state and total pressure loss in the large angle diffusion section. In the case of linear wall diffusion, because the diffusion angle is too large, the separation effect of the first layer damping net on the inlet of the large angle diffusion section is very weak, and the total pressure loss can not reach the expected set target. When the cubic curve is used for wall diffusion, the total pressure loss is obviously reduced, which is smaller than the expected index, but there is a small range of separation. The stepwise diffusion can effectively reduce the total pressure loss. The step diffusion section designed according to the maximum static pressure recovery avoids the flow separation at the inlet and can greatly reduce the total pressure loss. Further study on the stepwise diffusion shows that the diffusion angle of the first stage according to the maximum static pressure recovery design has reached the upper limit. In order to restrain the separation of the third stage of diffusion and shorten the second stage of diffusion, The method of reducing the diffusion angle of the third stage diffusion section is reasonable. The optimum parameter matching is obtained by comparing the flow patterns of different schemes, and the total pressure loss index meets the design requirements. Therefore, the optimal design results of large angle diffusion section can be obtained by numerical simulation.
【作者單位】: 中國空氣動(dòng)力研究與發(fā)展中心空氣動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室;中國空氣動(dòng)力研究與發(fā)展中心設(shè)備設(shè)計(jì)及測試技術(shù)研究所;
【基金】:空氣動(dòng)力學(xué)國家重點(diǎn)實(shí)驗(yàn)室基金(SKLA2013A0208)
【分類號】:V211.74
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