航空计算技术
航空計算技術
항공계산기술
AERONAUTICAL COMPUTER TECHNIQUE
2015年
3期
30-34
,共5页
延迟分离涡模拟%气动噪声%声压级%腔体%舱门
延遲分離渦模擬%氣動譟聲%聲壓級%腔體%艙門
연지분리와모의%기동조성%성압급%강체%창문
DDES%aerodynamic noise%sound pressure level%cavity%door
采用延迟分离涡仿真( DDES)的方法研究了空腔和带有舱门的腔体的气动噪声特性。仿真在自由来流M=0.85下,长宽深比值为5:1:1的矩形开放腔体展开。空腔仿真的声压级幅值结果与试验数据相比误差在4%以内,频率位置的预测较好。 DDES方法对于气动噪声问题具有很好的仿真准确性。空腔仿真结果和带有舱门的结果对比后表明,舱门迫使剪切层气流更多的撞击后壁进入腔体内部,使腔体内部尤其是中部压强波动增大,声压级在低频部分增量显著,达到了5 dB左右。
採用延遲分離渦倣真( DDES)的方法研究瞭空腔和帶有艙門的腔體的氣動譟聲特性。倣真在自由來流M=0.85下,長寬深比值為5:1:1的矩形開放腔體展開。空腔倣真的聲壓級幅值結果與試驗數據相比誤差在4%以內,頻率位置的預測較好。 DDES方法對于氣動譟聲問題具有很好的倣真準確性。空腔倣真結果和帶有艙門的結果對比後錶明,艙門迫使剪切層氣流更多的撞擊後壁進入腔體內部,使腔體內部尤其是中部壓彊波動增大,聲壓級在低頻部分增量顯著,達到瞭5 dB左右。
채용연지분리와방진( DDES)적방법연구료공강화대유창문적강체적기동조성특성。방진재자유래류M=0.85하,장관심비치위5:1:1적구형개방강체전개。공강방진적성압급폭치결과여시험수거상비오차재4%이내,빈솔위치적예측교호。 DDES방법대우기동조성문제구유흔호적방진준학성。공강방진결과화대유창문적결과대비후표명,창문박사전절층기류경다적당격후벽진입강체내부,사강체내부우기시중부압강파동증대,성압급재저빈부분증량현저,체도료5 dB좌우。
Delayed detached eddy simulation ( DDES) approach was performed to numerically investigate an open cavity and the effects of doors on the edges of this rectangular open cavity .The open cavity had an aspect ratio of 5:1:1 and the free-stream flow had a Mach number of 0 .85.The simulation of clean cavity case was compared with the experiment with the deviation less than 4%.The simulation using DDES could predict the pressure fluctuation precisely .Comparisons of DDES for clean cavity and cavity with doors revealed that the SPLs inside the cavity as well as the magnitude of tones were amplified by the side doors .It was because that the side doors forced more vortices going into the cavity ,which would rise the fluctuation of the pressure in the cavity as well as the sound pressure level with increment up to 5 dB.