熱駐點 的英文怎麼說
中文拼音 [rèzhùdiǎn]
熱駐點
英文
thermal arrest-
After reviewing the history and recent developments of the research on thermoacoustics, and introducing the classical thermoacoustic theory, we carry out the following investigations : 1 ) thermoacoustically driven pulse tube refrigerator ( tadptr ) experiments have been done on the self - built pulse tube refrigerator driven by standing wave thermoacoustic prime mover system
本文首先回顧了熱聲機械的歷史及現狀，詳細介紹了熱聲學理論基礎，重點研究了以下若干問題： 1駐波型熱聲驅動器驅動脈管製冷機在自行搭建的駐波型熱聲驅動脈管製冷機實驗裝置上進行了實驗研究。The thermal visualizations of jet impingement cooling with single or double row holes inside semi - enclosed channel are measured by using infrared camera and then the impingement cooling heat transfer coefficients are deduced. the effects of flow and geometry parameters on convective heat coefficients are obtained. the results show that : for a single row normal impingement, the impingement cooling effectiveness is enhanced with the increase of impinging reynolds number or the decrease of hole space to diameter ratio, and the best effectiveness is achieved under the jet - to - surface spacing equals to 2 ; when the jet is oblique to the confined wall, the cooling effectiveness is weaken especially under the jet - to - surface spacing ratio is greater than 2 ; for double rows normal impingement cooling, the cooling effectiveness of rear row jet is weaker than the front row under lower impinging reynolds number or bigger jet - to - surface spacing
對于單排垂直射流，沖擊冷卻效果隨射流雷諾數的增加、孔間距與直徑比的減小而得到提高，沖擊間距比為2時換熱效果最好;沖擊孔中心線向通道封閉一側傾斜后，射流沖擊冷卻的范圍變窄，當沖擊間距比大於2時駐點區的對流換熱能力明顯降低;對于雙排沖擊射流，孔排間距與直徑比的增加使沖擊冷卻范圍變大，但在兩排孔之間區域的對流換熱系數有所下降;在較小的沖擊射流雷諾數和較大的沖擊間距比下，後排射流的沖擊換熱效果要遜於前排射流。Micro - jets impingement cooling heat sink is used to cool the high power lda owing to the very thin hydrodynamic and thermal boundary layers in the impingement region when a jet impinges on a surface. reasonable array of jets can develop the uniform of temperature distribution on target very much
微射流陣列冷卻熱沉，是利用射流沖擊在駐點區能產生很薄的邊界層來提高換熱效率的，合理的布置射流孔，可以極大的提高被冷卻表面溫度分佈的均勻性。After a detailed review on the historical developments of the research on thermoacoustics, as well as the latest advances in this field, prospective applications, and a survey of theoretical fundamentals, the present work focuses on the following sections : 1 ) standing wave thermoacoustic prime mover an experimental setup of standing wave thermoacoustic prime mover has been built up with brass matrix as the thermoacoustic stack
本文首先回顧了熱聲熱機的發展歷史及最新成就，在詳細介紹熱聲學理論基礎以及熱聲機械設計原則之後，重點研究了以下若干問題： 1駐波型熱聲驅動器建立了我國第一臺實用駐波型熱聲驅動器試驗臺，並進行了實驗研究。Abstract : approximate methods for calculating aerodynamic heating rates on space shuttles are discussed. various methods are given for predicting the heating rate at axisymmetric stagnation points, general three dimensional stagnationpoints and the leading edge stagnation point of wings. numerous laminar and turbulent heating techniques for flat plates and cones are analyzed and compared. a brief review of some methods is presented to predict heating rate for winward centerline and lateral direction off the symmetry plane. the results show that the methods are simpler and can guarantee enought precision for predicting aerodynamic heating environment of space shuttles
文摘:介紹了國內外預測航天飛機氣動加熱的工程計算方法.給出了軸對稱、非軸對稱和機翼前緣等各種外形駐點熱流密度的計算，分析和比較了平板、錐體的層流和湍流熱流密度計算的各種方法，概述了航天飛機迎風面中心線和離開中心線橫向熱流密度的計算.計算結果表明，本文方法用在航天飛機氣動熱環境初步設計中比較簡單並且有足夠精度The current proportions in the jetta, bora a4, golf a4 and caddy made by the venture stand at 98 per cent, 65 per cent, 60 per cent and 40 per cent respectively
截至目前，宇通公司依託先進的客車製造技術，已在深圳廣州蘇州寧波九寨溝等沿海發達地區及熱點旅遊景區大批進駐。Thirdly, this dissertation briefly introduces the engineering estimation method of the aerodynamic heat and supplies the simplified formulas. not considering the rejection, the ablation and some other factors, the author calculates the stagnation heat flux and the non - stagnation field heat flux distribution of some fly situation as the example aerodynamic heat environment. finally, by using the ansys program, the thermal vibration characters of the plate and missile body structures with different materials is analyzed
這一方法提高了熱振動的分析效率；第三，簡要的介紹了工程上計算氣動熟的估算方法及熱流密度計算的簡化公式，在不考慮燒蝕以及質量引射等影響下，本文計算了幾種飛行條件下駐點和非駐點區的熱流密度分佈，作為本論文算例的氣動加熱環境。The results show that, for reynolds number of 4400 ~ 23800, heat transfer coefficients at stagnation point always increase with the increasement of reynolds number ; the average deviation of heat transfer coefficients at stagnation point from published results is about 10. 8 %, which shows the system is reliable for temperature measurement
實驗結果表明，在re = 4400 28300范圍內，駐點區換熱系數隨雷諾數的增大而增大；駐點區換熱系數與前人的實驗結果相比平均誤差10 . 8 ，實驗系統具有很好的可靠性。It is found that, the heat transfer coefficients in the area after at stagnation point is higher than that of common jetting although the heat transfer coefficients are smaller at stagnation point, and, comparing to common jetting, rotary jetting contributes to the even distribution of heat transfer coefficients near stagnation point
結果表明，盡管旋轉射流的努謝爾特數在駐點附近低於普通射流的努謝爾特數，但在壁面射流區高於普通射流的努謝爾特數。與普通射流相比，旋轉射流導致駐點附近區域的換熱特性趨于均勻化。分享友人