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冲角     
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  incidence angle
     A Boundary Layer Method to Evaluate the Flow with Positive Incidence Angle in a Centrifugal Impeller
     离心叶轮正冲角流场计算的边界层方法
短句来源
     Under zero or small positive incidence angle flow conditions, the calculated isentropic Mach number at 50% blade's height gets closer to experimental values if the κ-ε model is used instead of the κ-ε model.
     在零冲角和不大的正冲角工况下,在50%叶高处叶片表面,κ-ε模型所计算的等熵马赫数比κ-ω模型更接近实验值;
短句来源
     The influence of incidence angle, blade's flexure angle and exit conditions on the effect of positive blade flexure is discussed.
     讨论了冲角、叶片弯曲角和出口条件对叶片正弯曲作用的影响.
短句来源
     The change of total flow loss is less 20% between-10° and 10° incidence angle. It is sure that the modification design of blade cascade is successful.
     同时变冲角性能得到极大改善,在±10°冲角范围内总流动损失系数变化不超20%,可以肯定该叶片改型设计是成功的。
短句来源
     Results of numerical analysis show that,under large negative incidence angle flow conditions,separation at leading edge's pressure surface can not been predicted by means of κ-ε models.
     数值分析结果表明:采用标准κ-ε模型进行计算时,在较大负冲角工况下,不能在叶栅压力面前缘预测到分离的产生;
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  “冲角”译为未确定词的双语例句
     Detailed measurements were taken of the flow field parameters and surface static pressure at the following incidences: 0°, +20°, -20°.
     详细测量了在0°、+20°、-20°冲角下的流场参数和表面静压。
短句来源
     The experimental results show that: for M_1=0.6 the working range is -10°1.2 the situations of unique incidence have been studied yet.
     M_1=1.1的工作范围是0°1.2仅出现唯一冲角的情况.
短句来源
     This paper recommends inlet velocity coefficient ko in the region 3.7~4.1, the blade angle of attack 8°~15°.
     本文推荐进口速度系数K_0=3.7~4.1范围,叶片进口冲角为8°~15°。
短句来源
     In this paper, two improved schemes, 73B and 73A, high pressure No. 9 guide cascade of 300mw unit contrast annular cascade experimental investigation that were conditioned on angle of attack at -20°,0°and +20°.
     对优化300MW汽轮机高压第九级静叶栅的73A和73B两套改型方案在冲角为-20°、0°和+20°的条件下进行了环形叶栅对比试验。
短句来源
     The lift coefficient was 1.68 and higher than tested other boards when attack angle was 25° and 28°.
     当冲角为25°和28°时,网板的升力系数均为1.68。
短句来源
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  相似匹配句对
     The Measurement of Angle of Attack Between Wheel and Rail by Using Laser
     用激光测试轮轨冲角
短句来源
     Functional Curve of Best Incidence Angle for Centrifugal Fan
     离心通风机最佳冲角的函数曲线
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  incidence angle
The surface composition of the blend films was determined by Fourier transform infra-red spectroscopy coupled with a variable incidence angle attenuated total reflection accessory (ATR-FTIR).
      
The effects of the laser radiation intensity, dimensions of the laser spot, and the incidence angle on the amplitude, shape, and width of the acoustic pulse have been studied.
      
The reflection and transmission matrices for mul-tilayered structures are obtained for the general case of an arbitrary incidence angle.
      
It is shown that the variations of the incidence angle, magnetization orientation, and polarization plane substantially affect the polarization characteristics and give rise to typical features in the dependences studied.
      
From the experimental data, dependences of the sputtering yield of these materials on the incidence angle and ion energy have been obtained and the surface relief patterns produced by target etching have been studied.
      
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  angle of incidence
We give equations which make it possible to reduce the problem of determining the aerodynamic characteristics of a body which is not axisymmetric to the problem of computing the flow past an equivalent body of rotation at zero angle of incidence.
      
The problem of the nonuniqueness of the angle of incidence of a fine jet into water is considered and the mathematical formulation of the problem is improved.
      
Since the angle of incidence of the shock wave αs coincides in the zero-order approximation with the angle of inclination of the bodys [1], the latter is usually used in the boundary conditions on the shock.
      
Dependences were obtained relating the probability of collision of the particles to the angle of incidence with the surface, their diameter, and the characteristic dimensions of the body in the flow, and also to their concentration.
      
The generalized Maxwell boundary condition that takes into account the dependence of the accommodation coefficient on the angle of incidence of gas molecules is considered as an example.
      
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In this article, the principle of bydro-electrical analogy is brieply disscussed. Besides, thewhole experimental set-up of F?culty of compressor Specialiation is discribed in detail, and theaxperimental techniquea is sysematically analized. By this set-up, we made at investigation on tbe K-1 Profile lattice, and got the directionand the velocity distribution around the profile at zero angle of attack, By the method of"Wenig" the velocity picture at any angle of attack was calculateel and Presented. In this article,...

In this article, the principle of bydro-electrical analogy is brieply disscussed. Besides, thewhole experimental set-up of F?culty of compressor Specialiation is discribed in detail, and theaxperimental techniquea is sysematically analized. By this set-up, we made at investigation on tbe K-1 Profile lattice, and got the directionand the velocity distribution around the profile at zero angle of attack, By the method of"Wenig" the velocity picture at any angle of attack was calculateel and Presented. In this article, Tbe problms of electrical field and the p?ase angle compensation arealao discussed.

本文介绍了液电比拟的相似原理,并对压缩机教研组所设计的装置作了详细的介绍,关于测量方法也作了系统的说明。应用此项装置对K-1叶型叶栅进行了试验,得出了叶型零举力方向及速度分布,并利用Wenig的平板叶栅理论计算出叶型任意冲角时的叶型表面速度分布。本文并对试验过程中的电场分布及相位补偿问题进行了讨论。

A simple nonlinear wing theory for the low-aspect-ratio rectangular flat plate with large angle of attack in incompressible flow is developed. The plate is replaced by a finite number of horseshoe vortex lines which are located along the chord of the plate and which are of different strength. The free parts of the vortex lines make an angle θ with the plate. For the solution of the problem an iterative procedure is applied. The angle θ is initially assumed to be one half of the angle of attack and the first...

A simple nonlinear wing theory for the low-aspect-ratio rectangular flat plate with large angle of attack in incompressible flow is developed. The plate is replaced by a finite number of horseshoe vortex lines which are located along the chord of the plate and which are of different strength. The free parts of the vortex lines make an angle θ with the plate. For the solution of the problem an iterative procedure is applied. The angle θ is initially assumed to be one half of the angle of attack and the first approximate values for the strength of the vortex lines are computed. By application of the Helmholtz principle at the side edges of the plate, the second approximate value for the angle θ is determined. By repeating this calculation, the second approximate values for the strength of the vortex lines and then the aerodynamic coefficients of the plate are obtained. A few examples are calculated and the theoretical results are compared with the experimental ones. It is shown that for low-aspect-ratio rectangular plates this theory agrees very well with the experiments.

本文系对不可压缩流体中大冲角小展弦比矩形平板机翼提出—个简单的非线性理论。平板系用有限条沿弦向分布的和强度不同的马蹄形渦线来代替。这些渦线的自由部分相对于平板成θ角。问题的求解,系用迭代法。作为第一次近似,将θ角取为冲角的一半,算出渦线强度的第一次近似值。然后在平板两侧缘处运用赫尔姆霍斯(Helmholtz)的渦旋原理,算出θ角的第二次近似值,从而得到渦线强度的第二次近似值,如此继续下去直至第m次近似,最后利用渦线强度的第m次近似值求出平板的举力系数、俯仰力矩系数和诱导阻力系数。作为例子,对展弦比为0.2,0.5,1.0与冲角为5°,10°,15°,20°,25°的平板进行了计算,并与实验结果和现有其它理论进行了比较,计算结果表明,本理论较现有其它理论给出与实验更为符合的结果;同时本理论较现有其它理论更为简单。

The paper describes the regularity of the effect of the impeller inlet and exit parameters and of the form of diffusion casing on the pump characteristic and efficiency. This regularity was initially obtained by means of hydraulic model experimental investigation.In order to improve the efficiency of submersible pump, wemay adopt measures to coutract the inlet diameter De, to increase the setting angle of the blade, and to extend the blade to the inlet edge so that the characteristic requirement can be fulfilled.This...

The paper describes the regularity of the effect of the impeller inlet and exit parameters and of the form of diffusion casing on the pump characteristic and efficiency. This regularity was initially obtained by means of hydraulic model experimental investigation.In order to improve the efficiency of submersible pump, wemay adopt measures to coutract the inlet diameter De, to increase the setting angle of the blade, and to extend the blade to the inlet edge so that the characteristic requirement can be fulfilled.This paper recommends inlet velocity coefficient ko in the region 3.7~4.1, the blade angle of attack 8°~15°. The form of inlet edge between two vanes should be sguare and then better hydraulic characteristics are obtained.Since the energy exchange in the diffusion casing was not so reasonable, the authors think that the formula for calcutating the outer diameter De of centrifugal pump impeller must be revised theoretically so that the characteristic requirement can be reached, This paper recommends velocity coefficient under several specific speeds ns.The relationship between the throat area F3 of diffusion casing and impeller exit area F2 is one of the important factors deciding the characteristics of the submersible pump.This paper recommends F3/F2 in the region 0.7~1. There is no oscillation or noise no matter whether the number of vanes in the diffusion casing and impeller are the same or not.

本文阐述了通过水力模型试验研究,初步摸索到的有关叶轮进、出口参数及空间导壳参数对潜水泵性能及效率影响的规律。 为了提高潜水泵的效率,可以采取缩小进口直径D_e,加大叶片安放角α_(?),叶片向进口方向延伸等措施来满足对性能的要求。本文推荐进口速度系数K_0=3.7~4.1范围,叶片进口冲角为8°~15°。两叶片之间进口边面积形状为正方形时,泵的水力性能较好。 空间导壳能量转换得不好,本文作者们认为,必须从理论上修正离心泵叶轮外径D_2的计算公式才能达到性能要求。本文推荐了几种不同的比转速n_s的速度系数K_(m2)、K_(μ2)范围。 空间导壳的喉部面积F_3与叶轮出口面积F_2之间的相互关系是决定泵性能好坏的重要因素之 ,本文推荐F_3/F_2在0.7~1范围内。无论导壳叶片数Z_H与叶轮叶片数Z相同或不相同时均无振动与噪音。

 
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