等熵

从冲击绝热线和Gruneisen物态方程出发，导出了与冲击绝热线相容的等熵线，进而给出了沿等熵压缩线和等温压缩线以及冲击绝热线的声速的计算公式。

In this paper , from the shock adiabatics and the Gruneisen equation of state , an isentropic , which corresponds to shock adiabatics , is delivered , and the formulas of calculating sound velocity along isentropic and isothermal compression , as well as the Hugoniot curves , are presented .

等熵方程与生物熵限方程

The Isentropic Equations and the Entropy Limit Equation of Species

绝热指数为1的一维非等熵流气体动力学方程组Cauchy问题

Cauchy Problem for One-dimensional Gas Dynamics Systems With the Adiabatic Exponent 1

一维等熵Navier-Stokes方程的泛函分离变量解

Solutions of functional separation of variables to the isothermal compressible Navier-Stokes equations in one dimension

·在初始密度不连续的条件下，证明了粘性依赖于密度的一维等熵可压缩Navier-Stokes方程组自由边界问题的弱解的存在性和唯一性；

The existence and uniqueness of weak solutions to 1-D isentropic compressible Navier-Stokes equations with density-dependent viscosity and discontinuous initial density ;

而对非等熵的情形，即对整个的Euler方程组的情形，证明了激波解的局部存在性。

For the case of non-isentropic case , i.e. , the whole Euler equations , we give the local existence of shock front solution .

在等熵方程为压力是密度的任意单值函数形式情况下，分析了RT（RayleighTaylor）不稳定性中流体可压缩性的作用。

The role of fluid compressibility in Rayleigh Taylor instability is studied when the state equation of compressible fluid is an arbitrary function of density and pressure .

通过对处理的数据使用如Huffman编码或者代数编码等熵编码技术能够获得更多的压缩。

More compression can be attained by encoding the processed data using an entropy coding technique like Huffman coding or Arithmetic coding .

本文主要研究一维粘性等熵Euler方程组的一个初-边值问题及带有人工粘性的二维定常等熵无旋平面流方程组的初值问题及初-边值问题。

In this paper , we consider Cauchy problems and initial-boundary value problems of one-dimensional isentropic Euler system and 2-dimensional steady isentropic irrotational planar flow with fixed viscosity .

本文以ρV为因变量将可压缩等熵无粘流非线性方程的解表示成完全边界积分形式，从而将问题的计算维数降低一维。

A pure boundary integral formulation for the nonlinear equation of steady compressible nonviscous flow is given by using p Vas the dependent variable and thus the computational dimension of the problem is reduced by one .

Ricker子波和衰减余弦子波的等熵时频分布

Isentropic time frequency distribution of Ricker wavelet and attenuation cosine wavelet signals

由于等熵位涡分析的应用受等熵面倾斜的限制，又进而发展了Z坐标及P坐标中的倾斜涡度发展理论。

However , the application of the usual analysis of moist isentropic potential vorticity is limitted due to the declination of moist isentropic surfaces , and a theory of slantwise vorticity development based on Z-coordinate and P-coordinate was then proposed .

本文根据Lagrange质点理论，在引入Lagrange函数的基础上，应用Hamilton原理，导出了等熵大气运动中的Ertel位涡守恒定理。

In this paper , Hamilton 's principle is used to obtain the conservation theorem of Ertel potential vorticity by introducing Lagrange function according to Lagrange theory .

在Lagrangian坐标下，研究了具有其种源的带粘性的等熵气体运动方程组的Cauchy问题，给出了整体解的存在性和渐近性。

This paper considers in the Lagrangian coordinates the Cauchy problem to in-homogeneous systems of isentropic gas motion with viscosity and gives the existence and asymptotic behaviors of the global solutions .

提出了基于低速等熵流涡声理论和CFD数值计算方法相结合的部分管道式轴流风扇系统气动噪声源辨识方法，在此基础上发展了基于CFD的涡脱落噪声预测模型。

Next , the methods used to identify noise source of partly-ducted axial flow fan are introduced , which is based on vortex sound theory of low Mach number and homentropic flow together with CFD simulation .

W-Mo-Ti体系梯度飞片材料的制备及其准等熵压缩特性

Preparation and Quasi-isentropic Compressive Characteristics of W-Mo-Ti Flier-plate with Graded Wave Impedance

其次对三维等熵辐射流体力学方程组，我们证明该系统的一些C1解无论初值的大小，必在有限时间内产生破裂。

Second for the three-dimensional isentropic radiation hydrodynamics equations , we prove that some C1 so-lutions should blow-up in a finite time regardless of the size of the initial disturbance .

用Simons法对真空羽流流场进行了解析计算，包括等熵核心区和边界层膨胀区的计算，得到了符合流动规律的结果。

Computation based on the Simons model for vacuum plume was presented considering the expansion of the isentropic core and boundary layer .

第二章研究一维粘性等熵Euler方程组初-边值问题粘性激波的渐近稳定性，此问题可以看作不可渗透问题的一个扰动。

In Chapter 2 , we study asymptotic stability of the viscous shock to the initial-boundary value problem of one-dimensional isentropic Euler system with viscosity , which can be regarded as a perturbation of impermeable problem .

用湿热成风、相对中层涡旋、等熵位涡、惯性稳定度等讨论了MCC的发生发展机理。

The MCC develops mechanism is analyzed based on moist thermal wind theory , relatively mesoscale convectively generated vortex , Potential Vorticity Thinking , inertial instability theory and so on .

W-Mo-Ti-Mg系波阻抗梯度飞片材料的准等熵压缩特性

Quasi - isentropic Compressive Characteristics of W-Mo-Ti-Mg System Flier-plate with Graded Wave Impedance

·当初始密度不含真空状态时，证明了粘性依赖于密度的一维等熵可压缩Navier-Stokes方程组的解不会产生真空状态；

In the following chapters , we study these five problems : the non-formation of vacuum states for 1-D isentropic compressible Navier-Stokes equations with density-dependent viscosity , provided that no vacuum states are present initially ;

Li2O-Al2O3-SiO2系微晶玻璃具有较低的热膨胀系数和良好的可加工性，作为一类较好的斜波发生器材料，在准等熵压缩方面具有特殊的应用价值和研究意义。

As a kind of material of ramp-wave generator , Li2O-Al2O3-SiO2 system glass-ceramic has very important application in quasi-isentropic compression due to a low coefficient of thermal expansion and fine processing .

等熵可压Navier-Stokes-Poisson方程局部强解适定性

Local Strong Solutions of Navier-Stokes-Poisson Equations for Isentropic Compressible Fluids

200GPa压力范围内铝和铜的等熵压缩线计算

Compression Isentropes of Aluminum and Copper up to 200 GPa

在二级轻气炮上进行了W-Mo-Ti体系梯度飞片材料准等熵压缩特性的实验研究，利用梯度飞片成功实现了对93W合金的准等熵压缩。

Finally , experiments of quasi-isentropic loading to 93W alloys via W-Mo-Ti flier-plates were performed on a two-stage light gas gun .

采用三维粘性、等熵、可压缩、非定常流的Navier-Stokes方程，用有限体积法进行区域离散，对高速列车通过设置有横通道的隧道时所引起的出口微压波进行模拟。

This paper presents a cell-centered finite volume scheme for numerical integration of Navier-Stokes equations for three-dimensional unsteady viscous compressible non-homentropic flow to simulate the micro-pressure wave produced by a high-speed train entering a tunnel with a transverse passage-way .

利用3S程序计算得到的速度时间历史与实验结果吻合较好，数值模拟结果表明飞片内温升较低，磁驱动飞片过程基本上为准等熵过程。

We use program 3S to calculate the velocity history of flyer plates and is consistent to the experiment results . The numerical simulation results indicate that the temperature increasing is relatively low in flyer plates and the load is quasi-isentropic .

探索了磁场准等熵驱动飞片发射的实验技术，在FP-1装置上成功实现了多种尺寸飞片的驱动实验，并利用VISAR系统获得了飞片的速度历史曲线。

Experiments were performed to investigate the quasi-isentropic magnetically driven flyer plates with several sizes on FP-1 , and their velocity histories were recorded by VISAR .

S2计算中高低压涡轮的整体等熵效率由87.1%提高到87.5%，动力涡轮的的等熵效率由91.7%提高到92.1%。

By the S2 calculation of the high and low pressure turbines , the isentropic efficiency was improved to 87.5 % from 87.1 % , power turbines of the turbine isentropic efficiency was improved to 92.1 % from 91.7 % .