本文選題：超聲速膨脹器 + 隔板��； 參考：《航空學(xué)報(bào)》2016年02期

【摘要】：隔板與機(jī)匣之間留有間隙,間隙的存在勢(shì)必會(huì)對(duì)超聲速膨脹器的內(nèi)部流場(chǎng)和總體性能產(chǎn)生影響,為了獲得超聲速膨脹器內(nèi)部間隙流動(dòng)的流動(dòng)細(xì)節(jié),采用三維雷諾平均Navier-Stokes方程和標(biāo)準(zhǔn)k-ε湍流模型,就頂部間隙對(duì)超聲速膨脹器流動(dòng)特性的影響進(jìn)行了數(shù)值研究。結(jié)果表明:膨脹流道出口斜激波導(dǎo)致吸力面壓力高于壓力面,隔板尾緣附近部分泄漏流體經(jīng)間隙流回壓力面?zhèn)?間隙的存在導(dǎo)致吸力面進(jìn)口及中、后部近下端壁壓力上升,而壓力面前緣附近壓力下降,對(duì)比同一隔板位置,間隙高度每增加1%喉部高度,超聲速膨脹器隔板載荷系數(shù)最高下降2.6%;端壁損失和斜激波損失降低,但產(chǎn)生了泄漏損失,三維流道內(nèi)總的流動(dòng)損失增加,膨脹器效率降低,本文研究范圍內(nèi)效率最多下降8.8%;馬蹄渦、泄漏渦及二者之間的相互作用是頂部區(qū)域的主要渦系結(jié)構(gòu);前緣附近氣流經(jīng)間隙流到吸力面?zhèn)群臀簿壐浇孤┝黧w越過間隙重新流回壓力面?zhèn)仁情g隙內(nèi)氣流的主要運(yùn)動(dòng)形式。
[Abstract]:There is a gap between the diaphragm and the casing, and the existence of the gap will inevitably affect the internal flow field and the overall energy of the supersonic expander. In order to obtain the flow details of the gap flow in the supersonic expander, The effect of top clearance on the flow characteristics of supersonic expander is studied numerically by using the three dimensional Reynolds average Navier-Stokes equation and the standard k- 蔚 turbulence model. The results show that the suction surface pressure is higher than the pressure surface due to the oblique shock wave at the outlet of the expansion passage, and the leakage fluid near the tail edge of the diaphragm flows back to the pressure surface side through the clearance, and the existence of the gap causes the suction surface inlet, middle and lower end wall pressure to rise. However, the pressure near the front edge of the pressure decreases, compared with the same diaphragm position, the maximum load coefficient of the supersonic expander diaphragm decreases by 2.6% for every 1% increase in the clearance height, and the end wall loss and oblique shock loss decrease, but the leakage loss occurs. The total flow loss in the three-dimensional channel increases and the efficiency of the expander decreases, the efficiency of the expander decreases at most 8.8 in the range studied in this paper, the horseshoe vortex, the leakage vortex and the interaction between the two are the main vortex structures in the top region. The main movement form of the airflow in the gap is that the air flow near the front edge flows to the suction surface and the tail edge to the suction surface and near the tail edge to reflow back to the pressure surface through the clearance.
【作者單位】： 大連海事大學(xué)輪機(jī)工程學(xué)院;
【基金】：高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(20132125120006) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(3132014319) 遼寧省高校創(chuàng)新團(tuán)隊(duì)支持計(jì)劃(LT2015004)~~
【分類號(hào)】：O354.3;V211

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