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脉动     
相关语句
  pulsation
    Analysis for Influence of Bulk-cavity Effect on Compressor′s Pressure Pulsation
    容腔效应对压气机压力脉动影响的分析
短句来源
    The predicted axial and tangential time averaged velocities,as well as the root mean square averaged pulsation velocities,the distribution of temperature,CO_2 and H_2O concentration,all agree quite well with experimental data,herewith verifying the unified second order moment model's reliability.
    预报的轴向、切向时均速度、脉动速度均方根值、温度以及CO2和H2O浓度分布都和实验值吻合,验证了统一二阶矩模型的可靠性。
短句来源
    AN EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AUGMENT BY FLUID PULSATION IN A TUBE
    管内流体脉动对强化换热的影响
短句来源
    Analysis about the Total Pressure Pulsation in the Distorted Flow Field at the Inlet of Aeroengine
    发动机进气总压畸变流场中压力脉动分析
短句来源
    On the contrary, for convection heattransfer in a periodically baffled tube or around a vibrated cylinder, there existvelocity component normal to the wall surface, both the flow pulsation and thecylinder vibration make the fluid oscillate perpendicular to the wall, which improvesthe synergy between the velocity and temperature gradient fields, therefore, the heattransfer can be enhanced by flow pulsation or cylinder vibration.
    而流体在带有内环肋的圆管中流动或绕流振动圆柱时均存在垂直于换热壁面方向的速度分量,脉冲流动或圆柱振动使流体在垂直于换热壁面的方向产生脉动,改善了速度和温度梯度场的协同,从而使换热强化。
短句来源
更多       
  fluctuation
    As for the problems in the experimentation, such as the slow response speed of axes torque control, the disturbance of torque control to position control of throttle lever and the torque fluctuation of axis, solutions had been put forward and proved theoretically.
    对于试验过程中出现的以下问题,油门杆高速运动中输入轴力矩控制的响应速度较慢,输入轴力矩控制对油门杆位置控制的扰动,以及输入轴力矩脉动现象,提出了解决方法,并且从理论上加以验证。
短句来源
    With increase of ζ the structural vibration and acoustic fluctuation are turned from uncoupling to coupling.
    随着ζ的增加,结构振动与流体声波压力脉动由非耦合变为耦合。
短句来源
    ESTIMATION OF THE MAXIMUM INSTANTANEOUS DISTORTION WITH CORRELATED FLUCTUATION PRESSURES
    脉动压力相关时最大瞬时畸变值的预估
短句来源
    Vortices structure and pressure fluctuation characteristics of the flowover slender body at high angles of attack
    细长旋成体大迎角绕流的背涡结构与压力脉动特性
短句来源
    Phase delay of the Reynolds stress and wall pressure fluctuation in wall shear flows
    湍流边界层雷诺应力和壁脉动压强相位滞后分析
短句来源
更多       
  pulsating
    A REVIEW AND PROSPECT OF PULSATING COMBUSTION
    脉动燃烧技术的回顾和展望
短句来源
    Pulsating Combustion Technology and Its Application
    脉动燃烧技术及其应用
短句来源
    Experimental Research of Rijke Type Pulsating Combustion Technology and Its Engineering Applications
    里克型脉动燃烧技术工程化应用实验研究
短句来源
    A Study of Combustion Technology Featuring the Pulsating Feed of Fuel and the Influence Exerted by Various Parameters
    脉动供燃料燃烧技术及各参数影响研究
短句来源
    NUMERICAL STUDY OF ENHANCING HEAT TRANSFER BY PULSATING FLOW
    脉动流动强化换热的数值研究
短句来源
更多       
  fluctuating
    PREDICTION OF MANEUVERING REENTRY VEHICLES FLUCTUATING PRESSURE ENVIRONMENTS
    再人飞行器脉动压力环境的分析与预测
短句来源
    LAUNCH VEHICLE FLUCTUATING PRESSURE REDUCTION BY PASSIVE SHOCK-WAVE/BOUNDARY-LAYER CONTROL
    用激波-边界层被动控制降低运载火箭的脉动压力
短句来源
    ANALYSES AND CALCULATIONS FOR FLUCTUATING PROPERTIES OF ATTACHED BOUNDARY LAYERS IN SHOCK TUBE
    激波管壁面边界层脉动特性的分析与计算
短句来源
    Discussion on the Relations BetweenSpherical Point Fluctuating Pressure andSpherical Fluctuating Loads
    球面点脉动压力与面脉动荷载关系探讨
短句来源
    The Prediction of Fluctuating Pressure on the Surface of Reentry Vehicles
    再入体表面脉动压力环境的预测
短句来源
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      pulsation
    Operating characteristics of solid-state fermentation bioreactor with air pressure pulsation
          
    The paper deals with the development of a novel SSF bioreactor with air pressure pulsation.
          
    By developing a measurement and control system under the Virtual Instrument (VI) concept, the performance of the SSF bioreactor with pressure pulsation was studied by cultivating Trichoderma koningii in solid medium made of wheat bran and corncob.
          
    The cooling effects of pressure pulsation on solid porous beds are discussed.
          
    Experimental results show that pressure pulsation enhances medium moisture evaporation, and hence, heat dissipation.
          
    更多          
      fluctuation
    In this paper, the classical risk process perturbed by diffusion is generalized by allowing for "size fluctuation" and the ruin probability for this new model is discussed.
          
    A new feature extraction method using the amplitude fluctuation property of target HRRP for radar automatic target recognition
          
    Actually, the amplitude fluctuation property of target HRRP also represents some feature information of the target.
          
    Based on the scattering center model, a new feature extraction method using the amplitude fluctuation property of target HRRP is proposed in this paper.
          
    Effect of soil water changes on photosynthetic characteristics of Taxodium distichum seedlings in the hydro-fluctuation belt of
          
    更多          
      pulsating
    It is shown that frequency variations in Ca2+ oscillatory influx induce changes of pulsating enzyme activity.
          
    Pulsating motions of a solid particle in turbulent flow
          
    Radiation of a pulsating sphere in a viscous medium
          
    Interaction of a swarm of particles with a pulsating liquid at small Reynolds numbers
          
    The effect of the injection parameter on the averaged and pulsating velocity and concentration distributions in the layer is analyzed.
          
    更多          
      fluctuating
    The results show that centroids of burned areas in these three regions are in a fluctuating condition that encircles the distribution center.
          
    The developmental stability indices, leaf width based fluctuating asymmetry (FA1), and lateral vein length based directional asymmetry (RDA1) of Platanus acerifolia were studied.
          
    Fluctuations and patterns of desert rodent communities under human disturbance: fluctuating tendency and sensitive response of t
          
    The fluctuating tendency of rodent communities and the sensitive response of their populations were studied using mark-recapture and trap-day methods.
          
    Annual variation in hematological indices in a fluctuating population of bank vole (Clethrionomys glareolus)
          
    更多          


    The rotating stall in the compressor is investigated in this paper. The flow model of vortex systems and method for computing the flow field are estaflished by vortex theory. The computing examples for subsonic and transonic rotors are presented. The flow field and characteristic parameters in transonic rotor under the conditions of rotating stall are measured by combining hotwire-anemometer and fluctuating -pressure-barometer. The flow behaviors of rotating stall in transonic rotor are analysed and investigated....

    The rotating stall in the compressor is investigated in this paper. The flow model of vortex systems and method for computing the flow field are estaflished by vortex theory. The computing examples for subsonic and transonic rotors are presented. The flow field and characteristic parameters in transonic rotor under the conditions of rotating stall are measured by combining hotwire-anemometer and fluctuating -pressure-barometer. The flow behaviors of rotating stall in transonic rotor are analysed and investigated. Some new flow phenomena are discovered. Which are valuable to investigate further.

    本文研究了跨音转子的旋转失速现象。用旋涡理论建立了旋转失速工况下的涡系流动模型及流场算方法,给出了低速转子和跨音砖子的流场计算实例。用热线风速仪和脉动压力测试仪相结合测定了跨音转子的速度场及特征参数。分析和研究了跨音转子中旋转失速现象发生、发展和消失过程及其流动特点,其中发现了一些新的,有研究价值的流动现象。

    This report summarizes the influence of flow unsteadiness on experimental data in high speed wind tunnels, expounds why measurement of flow unsteadiness is necessary during calibration of high speed wind tunnels, discribes the transducers and instruments for measurement of flow unsteadiness and discnsses the permissible level of flow unsteadiness.

    本文综述了高速风洞气流脉动对实验数据的影响,阐明了把气流脉动测量作为高速风洞流场校测必测项目的理由,介绍了测量气流脉动所用传感器、设备,讨论了气流脉动指标。

    The performance data and flow characteristics for two-dimensional single-plane diffuser designed by dM/dx=constant have been studied experimentally at high subsonic speeds in a small diffuser tunnel. The tests were carried out at M1( diffuser entrance Mach number)≈0.2-0.8, corresponding to a Reynolds number range of 2.08×105-8.32×05. Both time-mean flow properties and fluctuating flow properties have been measured.The test results show that the value of steady-state performance is affected to a great extent...

    The performance data and flow characteristics for two-dimensional single-plane diffuser designed by dM/dx=constant have been studied experimentally at high subsonic speeds in a small diffuser tunnel. The tests were carried out at M1( diffuser entrance Mach number)≈0.2-0.8, corresponding to a Reynolds number range of 2.08×105-8.32×05. Both time-mean flow properties and fluctuating flow properties have been measured.The test results show that the value of steady-state performance is affected to a great extent by inlet conditions and geometry parameters of diffusers. The maximum total pressure fluctuation occurring in the turbulent shear layer and the location of value is nearly equal to 0.6-0.75.

    本文介绍一种按dM/dx=常数设计的二元高亚音速扩压器的试验研究结果。所试验的扩压器进口M数为0.2—0.8,其相应的雷诺数为2.08×10~5—8.32×10~5。该扩压器的进口堵塞比B=2δ_1~*/W_1≈0.049;展弦比AS=1.33;扩压器长度与进口高度之比L/W_1≈6.35;面积比AR=2.08。对该扩压器进行了静态性能和动态性能的测量,并仔细地测量了扩压器沿程紊流附面层的发展,通过流谱观察,测得气流分离点的位置及分离区的大小。试验结果指出:扩压器静态性能与一元理想流的数值相比差别较大,靠近扩压器出口有较大分离区。扩压器内的最大总压脉动发生在紊流剪切层内,其位置高度与剪切层厚度的比值大约在0.6—0.75之间。

     
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