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排序方式: 共有37条查询结果,搜索用时 31 毫秒
1.
障碍物和管壁导致火焰加速的三维数值模拟   总被引:21,自引:3,他引:18  
基于K-ε模型和改进的EBU-Arrehnius燃烧模型,考虑了障碍物对流动的附加作用,通过修改方程的源项,建立了湍流加速火焰现象的理论模型。选用Simple格式,壁面边界层采用壁面函数法处理,模拟了障碍物和摩擦管壁在三维空间中导致火焰加速的现象,结果表明障碍物和管壁对火焰都有明显的加速作用,且障碍物的加速作用更明显,最后分析了导致火焰加速的机理。  相似文献
2.
By means of computational fluid dynamics (CFD) this study examines cavitation effects behind obstacles and within an automotive fuel jet pump. Especially with regard to gasoline such effects are serious issues for applications of jet pumps in automotive fuel systems. The cavitation phenomena are captured by a model based on a void region approach within the volume-of-fluid method (VOF) including the k--model of turbulence. A first-order and a second-order scheme are compared, and the potential of the numerical method is evaluated by considering benchmark cases.  相似文献
3.
数值模拟孤立波通过水下孤立方柱的粘性流动   总被引:2,自引:0,他引:2  
万德成  戴世强 《上海力学》1998,19(4):297-304
本文用完整二维Navier-Stokes方程和VOF方法,研究孤立波通过淹没水下孤立直立方柱水域时的波形变化和粘性流场运动。本文对孤立波通过水下 孤立直方柱的情形进行了实例计算。给出了波形随时间的演化图,可以看到反射波、前传波和跟随的振荡型小波列的生成及涡流场的运动演化,并与势流计算结果进行了比较。  相似文献
4.
湍流加速火焰的三维数值模拟   总被引:2,自引:0,他引:2  
火焰在设有障碍物的管内传播时会自身加速,并可能导致爆炸。本文基于湍流κ-ε模型和改进的EBU—Arrhenius反应模型,对该现象进行了三维空间的数值模拟。计算结果反映了障碍物、湍流和火焰之间相互作用的正反馈机理,描绘了火焰在管内加速传播的三维图像。  相似文献
5.
Shock wave attenuation by grids and orifice plates   总被引:2,自引:0,他引:2  
The interaction of weak shock waves with porous barriers of different geometries and porosities is examined. Installing a barrier inside the shock tube test section will cause the development of the following wave pattern upon a head-on collision between the incident shock wave and the barrier: a reflected shock from the barrier and a transmitted shock propagating towards the shock tube end wall. Once the transmitted shock wave reaches the end wall it is reflected back towards the barrier. This is the beginning of multiple reflections between the barrier and the end wall. This full cycle of shock reflections/interactions resulting from the incident shock wave collision with the barrier can be studied in a single shock tube test. A one-dimensional (1D), inviscid flow model was proposed for simulating the flow resulting from the initial collision of the incident shock wave with the barrier. Fairly good agreement is found between experimental findings and simulations based on a 1D flow model. Based on obtained numerical and experimental findings an optimal design procedure for shock wave attenuator is suggested. The suggested attenuator may ensure the safety of the shelter’s ventilation systems.  相似文献
6.
多障碍物通道中激波诱导气相爆轰的数值研究   总被引:1,自引:0,他引:1  
王春  张德良  姜宗林 《力学学报》2006,38(5):586-592
应用数值模拟方法,研究了直通道中激波经过多块矩形障碍物时诱导H2/O2混合气体起爆的物理机制。研究表明:在前导激波强度不足以诱导波后气体直接起爆的条件下,经过激波压缩的可燃气体也可能在远离激波的障碍物之间的凹槽部位起爆;障碍物表面产生的压缩波、膨胀波和气流滑移面对可燃气体的起爆、爆轰波的形成和传播过程有重要的影响;添加不同稀释比的氮气可以影响爆轰波后流场的温度分布;增加障碍物的间距可以改变可燃气起爆位置。  相似文献
7.
A study was made of the motion of axisymmetrical objects in viscous and viscoelastic fluids within a cylindrical tank with the assumption of negligible inertial effects. A numerical treatment based on the Stokes equations of motion and an optimization technique enabled the details of the velocity and rate-of-deformation fields for a Newtonian fluid to be predicted. The influence of the shape of various bodies, some even with concave surfaces, was examined. The corresponding experiments were carried out with viscous and viscoelastic fluids using a visualization technique. A correlation between the main flow characteristics and the rheological behaviour of the fluids was established.  相似文献
8.
Direct numerical simulation (DNS) of heat transfer in a channel flow obstructed by rectangular prisms has been performed for Reτ = 80–20, where Reτ is based on the friction velocity, the channel half width and the kinematic viscosity. The molecular Prandtl number is set to be 0.71. The flow remains unsteady down to Reτ = 40 owing to the disturbance induced by the prism. For Reτ = 30 and 20, the flow results in a steady laminar flow. In the vicinity of the prism, the three-dimensional complex vortices are generated and heat transfer is enhanced. The Reynolds number effect on the time-averaged vortex structure and the local Nusselt number are investigated. The mechanism of the heat transfer enhancement is discussed. In addition, the mean flow parameters such as the friction factor and the Nusselt number are examined in comparison with existing DNS and experimental data.  相似文献
9.
The detonation wave propagation in plane channels filled with a stoichiometric hydrogen-air mixture at rest under standard conditions is numerically modeled with account for the actual kinetics of the chemical interaction. The calculations show that the stable cellular structure of the detonation wave formed in a plane channel with parallel walls is not always uniquely determined by its width. The effect of transverse walls and sharp expansion of the channel on the propagation of the cellular detonation wave is studied. The conditions of conservation and restoration of detonation are determined. Original Russian Text ? T.A. Zhuravskaya, 2007, published in Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, 2007, Vol. 42, No. 6, pp. 135–143.  相似文献
10.
对轮式移动系统进行越障分析时,常以垂直越障作为评价标准.但是,月球车在凹凸不平的月面上行驶时,垂直越障模型不具有一般性.为此,本文对基于摇臂-转向架结构月球车在任意路面的越障进行了研究.一般情况下,由于任意路面越障模型相对复杂,可以建立的独立平衡方程数目少于未知变量数,因此无法得到越障能力与路面参数的函数关系式.针对上述问题,文中将最大有效牵引力假设引入越障模型中,得到了一种任意路面越障能力的判断准则.通过算例分析,表明了所提方法的有效性.  相似文献
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