
[流] 湍流邊界層;紊兩面層
Two-component LDV measurements in a turbulent boundary layer with zero pressure gra***nt have been performed.
利用二維LDV系統對零壓力梯度下光滑面和減阻溝槽面湍流邊界層流場進行對比測量。
A unified theory for calculating the noise radiation of an infinite elastic plate excited by turbulent boundary layer pressure fluctuations is presented.
本文提出一個統一的理論計算湍流邊界層壓力起伏激勵下無限大彈性闆的噪聲輻射。
During the computing model creating, emphasis are put on the calculation of input power from the turbulent boundary layer which is inhomogeneous to the sonar dome.
采用一種新的回轉體模型模拟聲呐罩,重點讨論了空間分布不均勻的湍流邊界層對聲呐罩的輸入功率的計算。
Mean velocity profile, turbulence intensity profile, integral scale and wind spectra are the most fundamental characteristics that describe the atmospheric turbulent boundary layer flow.
平均速度剖面,湍流度剖面,積分尺度和風譜是反映大氣湍流邊界層流動的四個最基本的因素。
This paper investigates the responses of the cylindrical area hydrophone and two-circular areahydrophone in viscoelastic cylindrical shell to the TBL (turbulent boundary layer) pressure fluctuations.
本文研究粘彈性圓柱殼内圓柱面和雙圓片形水聽器和陣對于TBL(湍流邊界層)壓力起伏的響應。
The theory of reacting turbulent boundary layer is a new field of the gas dynamics of SPRM.
反應湍流邊界層理論是固體火箭發動機氣體力學的新領域。
Wall heat transfer fluctuations have been measured using a platinum film resistance thermometer in forward facing steps induced shock wave and turbulent boundary layer interaction fields.
用鉑膜電阻溫度計測量了前向台階誘導激波與湍流邊界層相互作用流場中的表面熱流率脈動。
The results indicate that coating a compliant wall makes the logarithmic region of a turbulent boundary layer shift upwards as unstable hydrodynamic waves are absent.
這說明,在沒有水動力學不穩定發生的情況下,柔性壁會使湍流邊界層中速度型的對數區上移。
The influence of a viscoelastic compliant wall on the turbulent boundary layer was stu***d from the viewpoint of stability.
本文從穩定性的觀點出發,研究了粘彈性柔性壁對湍流邊界層的影響。
It provides qualitative information mainly concerning the overall flow structure, such as the turbulent boundary layer separation, reattachment locations and the dimensionalities of the flow.
它主要提供關于整個流動的定性信息,諸如湍流邊界層分離、再附着位置以及流動的維數等。
Finally recent stu***s of turbulent boundary layer separation are also briefly reviewed.
最後簡單介紹了目前在研究湍流邊界層分離方面的進展。
Develops a method to calculate the skin friction loss in incompressible turbulent boundary layer in the flow passage of a centrifugal fan's impeller.
提出一種計算離心通風機葉輪流道内不可壓湍流邊界層内摩擦損失的方法。
For understanding the mechanism of turbulent boundary layer better, coherent structures and the parameter of SL scaling law were researched with experimental methods.
在湍流邊界層中對SL标度律及其參數進行研究,可以加深對邊界層湍流的認識。
The turbulent boundary layer was separating on the lower curved wall under strong adverse pressure gra***nt and then reattaching on a parallel channel.
湍流邊界層在強逆壓梯度下于曲壁上分離,而後于後續的平直通道上再附。
The theoretical model of the coherent structure in the wall region of a turbulent boundary layer was proposed, using the idea of general resonant triad of the theory of hydrodynamic stability.
利用流動穩定性理論中的一般共振三波的概念,提出了湍流邊界層近壁區域相幹結構的理論模型。
This paper presents the surface characteristics of the inter-action between shock wave and turbulent boundary layer induced by sharp fin with emphasis on Mach number effects.
本文介紹了尖前緣翼誘導激波和湍流邊界層幹擾流場壁面特性,着重強調馬赫數影響。
Dissipative , Taylor , shear and integral scale are calculated , and the relationship between them and vertical locations in turbulent boundary layer are obtained.
同時計算了耗散尺度、泰勒尺度、剪切尺度和積分尺度等特征量,并給出它們沿平闆湍流邊界層法向位置的變化規律。
Two-dimensional incompressible turbulent boundary layer growth on the blades is calculated taking into account the blade surface curvature effect and also the rotational effect.
考慮到葉輪旋轉和葉片曲率的影響,求解了葉片表面的二元,不可壓湍流邊界層;
The measurement technique of constant temperature anemometry was used to study experimentally the mechanism of drag reduction in turbulent boundary layer with riblet surface.
應用熱線測速技術,對溝槽壁面平闆湍流邊界層的減阻機理進行了實驗研究。
Like in an infinite flow, we find that laminar boundary layer, transition region and turbulent boundary layer also exist along a flat plate in open channel flow boundary layers.
試驗研究發現明流光滑平闆邊界層中,與無限邊界繞流平闆邊界層一樣,沿平闆有層流邊界層,轉捩區和紊流邊界層三部分。
In this article, BL model is used to study three typical cases of compressible turbulent boundary layer, for which, data from direct numerical simulation(DNS) are available for comparison.
本文以BL模型為例,通過可壓縮湍流邊界層的三個典型算例,與直接數值模拟(DNS)的結果作對比。
This resulted in behaviour which deviated from that for equilibrium turbulent boundary layer induced by velocity shear only.
這導緻其隻與水流剪切力引起的湍流邊界層平衡相關。
It is shown by calculation and analysis that the main form of the interaction in compressor cascades is the interaction between shock wave and turbulent boundary layer in channels.
作者經過計算和分析,說明壓氣機葉栅流中主要的相互作用形式是葉栅槽道中激波和湍流附面層的相互作用。
Simulation of the atmospheric turbulent boundary layer is a prerequisite in wind tunnel simulation experiments.
對大氣湍流邊界層的真實模拟是風工程風洞模拟實驗所要滿足的基本條件之一。
Some calculating results on interaction between a normal shock and turbulent boundary layer in transonic flow over a curved wall are presented.
本文介紹彎曲壁面上湍流邊界層與正激波幹涉的某些計算結果。
Therefore the analysis results of time scale of fluctuating wall pressure can be used to indicate the time features of coherent structure of the turbulent boundary layer.
因而可以利用壁面壓強脈動信號的分析結果間接反映經過邊界層的相幹結構的時間特征。
The hydrogen bubble flow visualization technique was used to study the low speed streaks in the near wall region for the turbulent boundary layer flow over riblets surfaces.
應用氫氣泡流動顯示技術,對溝槽面湍流邊界層近壁區帶條結構進行了研究。
Inverse integral method is used for compressible turbulent boundary layer.
湍流邊界層采用積分反方法。
Wake laws are applied to deduce corressioning expressions of turbulent boundary layer thickness, the expressions are regarded as the auxiliary relational expressions to solve momentum thickness.
分析了葉片邊界層内的速度分布規律,運用尾流律推導出各種邊界層厚度的表達式,作為求解邊界層厚度的輔助關系式;
“turbulent boundary layer”(湍流邊界層)是流體力學中的重要概念,具體含義和特征如下:
指流體流經固體表面時,在靠近表面區域形成的湍流狀态邊界層。當流體流速超過臨界值或遇到表面粗糙度時,原本平穩的層流會轉變為充滿不規則渦旋的湍流狀态。
流動特性
流體粒子運動呈現不規則脈動和漩渦,速度分布較層流邊界層更均勻。
能量特性
因湍流混合作用,能量耗散顯著增加,導緻更高的摩擦阻力。
數學描述
常用雷諾平均方程(RANS)結合湍流模型(如k-ε模型)進行模拟,公式可表示為:
$$
frac{partial u_i}{partial t} + u_j frac{partial u_i}{partial x_j} = -frac{1}{rho}frac{partial p}{partial x_i} +
u frac{partial u_i}{partial x_j} - frac{partial overline{u_i'u_j'}}{partial x_j}
$$
其中$overline{u_i'u_j'}$為雷諾應力項。
與層流邊界層相比,湍流邊界層具有更厚的流動區域和更強的動量交換能力。實際工程中常通過雷諾數判斷邊界層類型。
可通過等來源進一步查閱研究案例。
形容詞
/tərbyələnt/
turbulent是一個形容詞,用來形容氣體或液體處于湍流狀态時的動蕩、混亂的情況。同時,turbulent也可以用來形容社會、政治、經濟等方面的動蕩、不穩定的情況。
stormy, tempestuous, tumultuous
calm, peaceful, tranquil
名詞
/ˈbaʊndəri/
boundary是一個名詞,用來表示某個範圍内的邊界或分界線,也可以用來表示某個範圍的界限或限制。
border, frontier, limit
unlimited, boundless, infinite
名詞
/ˈleɪər/
layer是一個名詞,用來表示事物的層次或分層結構。在醫學上,layer還可以表示神經膜等組織。
stratum, level, tier
monolayer, single layer
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