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Study on improvement of isentropic efficiently of closed cycle disk MHD generator

闭环盘式磁流体发生器等熵效率提高的研究

基本信息

批准号：
10680483
负责人：
INUI Yoshitaka
金额：
$ 1.73万
依托单位：
Toyohashi University of Technology (1999)Kyoto University (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680483/
关键词：
closed-cycle MHD disk generator isentropic efficiency generator configuration boundary layer diffuser back pressure shock wave 数値シミュレーション 2次元設計計算

项目摘要

To realize supersonic closed-cycle (nonequibrium) disk MHD generators with high isentropic efficiency, improvement of the efficiency in both the generation channel and the diffuser is necessary. Considering this fact, we carry out the following studies. At first, we newly developing a two-dimensional design calculation code of supersonic closed-cycle disk MHD generators which takes the effects of the boundary layer into consideration. Since the electric field strength usually takes almost the same vale in both the main flow and the boundary layer, constant electric field strength is adopted as a supplementary condition and the design calculation on the plane including the boundary layer without dividing the flow into the main flow and the boundary layer is realized by applying this condition all over the generator. It can determine the actual generator configuration and detailed two-dimensional quality distributions including the boundary layer. Next, we treat a large-scale high-perfor … More mance supersonic closed-cycle disk MHD generator using cesium-seeded helium plasma with 100MW thermal input, and investigate the effect of the diffuser back pressure on generator performance through detailed two-dimensional time-dependent numerical analyses for the region which includes the generation channel and the diffuser. In the simulation code, the gas dynamical quantity distributions are calculated by the TVD scheme proposed by Chakravarthy and Osher. It is made clear that high performance operation as designed and high isentropic efficiency including the diffuser region can be achieved by choosing the diffuser back pressure appropriately. The generator performance is influenced by the back pressure and its highest possible performance operation as designed and high isentropic efficiency including the diffuser region can be achieved by choosing the diffuser its highest possible performance can not be achieved in both the cases the back pressure is lower and higher than appropriate value. Less

为了实现具有高等熵效率的超音速闭合循环（非等熵）圆盘磁流体发电机，必须提高发电通道和扩压器的效率。考虑到这一事实，我们进行了以下研究。首先，我们开发了一个考虑边界层影响的超音速闭式循环圆盘磁流体发电机二维设计计算程序。由于电场强度在主流和边界层中通常取几乎相同的值，因此采用恒定电场强度作为补充条件，并通过将该条件应用于整个发电机来实现包括边界层的平面上的设计计算，而不将流动分为主流和边界层。它可以确定实际的发电机配置和详细的二维质量分布，包括边界层。接下来，我们对一个大规模的高性能 ...更多信息对100MW热输入的铯籽晶氦等离子体超音速闭式循环圆盘磁流体发电机进行了数值模拟，并对发电通道和扩散段进行了详细的二维时变数值分析，研究了扩散段背压对发电机性能的影响。在模拟程序中，气体动力学量分布采用Chakravarty和Osher提出的TVD格式计算。结果表明，通过合理选择扩压器背压，可以实现设计的高性能运行和包括扩压器区域在内的高等熵效率。发电机的性能受背压的影响，其最高性能按设计运行，通过选择扩压器可以实现包括扩压器区域在内的高等熵效率，但在背压低于和高于适当值的情况下，其最高性能都不能实现。少