兩種改善汽車風(fēng)洞軸向靜壓系數(shù)方法研究

改善軸向靜壓系數(shù)對(duì)提高汽車風(fēng)洞實(shí)驗(yàn)段流場品質(zhì)具有重要意義。實(shí)驗(yàn)與數(shù)值模擬均發(fā)現(xiàn)，增加收集口角度或增加收集口喉部間隙都能有效改善汽車風(fēng)洞實(shí)驗(yàn)段軸向靜壓系數(shù)，而且收集口角度越大或喉部間隙越大，軸向靜壓系數(shù)改善效果越明顯。另外，實(shí)驗(yàn)還比較了單獨(dú)增加收集口角度、收集口喉部間隙以及收集口角度和喉部間隙組合后對(duì)軸向靜壓系數(shù)的影響，旨在為全尺寸汽車風(fēng)洞改善軸向靜壓系數(shù)提供依據(jù)。
關(guān)鍵詞：汽車風(fēng)洞；軸向靜壓系數(shù)；收集口角度；收集口喉部間隙
Abstract: The flow quality of automotive wind tunnel test section can be improved by decreasing the axial static pressure coefficient. Both test results and numerical results show that the axial static pressure coefficient can be improved by increasing the collector angle or increasing gap of collector throat, and their effects become more and more obvious with larger collector angle and larger gap of collector throat. In addition, the influence of the axial static pressure by only increasing the collector angle or only increasing the gap of collector throat, and increasing both of them are compared. These findings can help to improve the axial static pressure of full scale automotive wind tunnel.