
n. 紊流脈動;紊動
A numerical model for turbulent fluctuation and diffusion of gas-particle flows is presented.
本文提出了氣固兩相流動的湍流擴散數學模型。
The results show that, the influences of turbulent fluctuation on time-averaged infrared signal in different wave band are different.
分析結果表明,在不同的探測波長上,湍流脈動引起的時均輻射信號變化不同;
The statistical analysis of turbulent fluctuation signals can be divided into two categories, large amount sample analysis and local time-frequency analysis respectively.
湍流脈動信號的數理統計可分為大樣本統計和局部時頻分析。
Turbulent fluctuation affects flow field parametersremarkably in a relatively short distance after transition point, but the effects get weaker quickly downstream;
在轉捩點後較近距離内湍流脈動影響較大,隨着向下遊流動脈動影響迅速減弱;
The dynamical basis of vortex motion solution is the set of equations of turbulent velocity fluctuation.
求渦旋運動解的動力學的基礎是湍流速度漲落方程。
Using these formulas and a 1-D LDA, mean square value of 2-D turbulent velocity fluctuation and Reynolds shear stress have been measured for water flow in a square duct.
用這些公式和一台一維激光多普勒測速計,測量了方形管道中水流的二維湍流速度脈動的均方值和雷諾切應力。
The properties of turbulent effects including intensity fluctuation, beam spread, spot quiver, and pathlength fluctuation of laser propagating through a folded Path are discussed.
本文讨論激光在折疊光路上傳輸時強度起伏、光束擴展、光束抖動和光程長度起伏等湍流效應的性質。
A general expression of the scintillation index is proposed for optical wave propagating in turbulent atmosphere under arbitrary fluctuation conditions.
提出了任意起伏條件下湍流大氣中光波閃爍方差的通用表達式。
The statistical characteristics of the laser log-intensity fluctuation and beam pattern in a turbulent atmosphere were stu***d systematically.
我們系統地研究了激光在湍流大氣中的光強起伏與光斑統計特征。
Based on turbulent kinetic energy and the rate of turbulent dissipation transport equations, the equation to calculate variance of the refractivity fluctuation is modeled.
根據湍流的動能和動能耗散率輸運方程,建立了折射率起伏方差的計算模型。
Measures the time mean velocity and velocity fluctuation using a hot film anemometer with different confinement ratio for the axisymmetric turbulent jet in a dead-end tunnel.
介紹了采用熱膜流速儀量測堵頭管中不同受限度軸對稱射流的時均流速和流速脈動。
Results show that fluctuation amplitudes of all the measured parameters in laminar jets are much smaller than those in turbulent ones.
結果顯示層流等離子體射流各參數的波動幅度遠小于湍流射流的對應值;
n.|turblence;紊流脈動;紊動
“turbulent fluctuation”是由流體力學領域延伸至多學科的專業術語,其含義可從詞源和學科應用兩方面解析:
1. 詞源解析
2. 學科應用
該術語的跨學科應用體現了其核心特征:非線性、不可預測性和能量傳遞特性。在工程領域,相關研究常涉及納維-斯托克斯方程中的雷諾應力項: $$ frac{partial u_i}{partial t} + u_j frac{partial u_i}{partial x_j} = -frac{1}{rho}frac{partial p}{partial x_i} + u frac{partial u_i}{partial x_j} - frac{partial overline{u_i'u_j'}}{partial x_j} $$ 式中最後一項即為湍流脈動引起的動量輸運。
“Turbulent fluctuation”是一個流體力學領域的術語,通常用于描述湍流(紊流)中流體物理量的隨機、不規則變化。以下為詳細解析:
Turbulent(湍流的/紊動的)
指流體運動中存在強烈渦旋、混合和不規則性的狀态,常見于高速流動或複雜邊界條件(如河流、大氣湍流)。其物理特性包括能量級聯和動量交換。
Fluctuation(脈動/波動)
表示物理量(如速度、壓力、溫度)隨時間或空間的無規則隨機變化。例如,電壓波動或經濟波動均屬于此類現象。
該術語特指湍流中流體參數的瞬時隨機變化,如速度、壓力等物理量的高頻振蕩。這種脈動是湍流區别于層流的核心特征,通常通過統計方法(如均方根值)量化分析。
湍流脈動的能量分布符合Kolmogorov尺度律,數學上可通過納維-斯托克斯方程描述: $$ frac{partial mathbf{u}}{partial t} + (mathbf{u} cdot abla)mathbf{u} = -frac{1}{rho} abla p + u abla mathbf{u} $$ 其中速度場$mathbf{u}$的瞬時值可分解為平均值$overline{mathbf{u}}$與脈動量$mathbf{u'}$之和($mathbf{u} = overline{mathbf{u}} + mathbf{u'}$)。
提到“紊流脈動是流體極不規則運動的體現”,而指出“電壓波動與湍流脈動同屬隨機波動現象”。
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