New Combustion Method for Direct Extracting Kinetic Energy and Application to Gas Turbine with Extremely High Efficiency

本研究分为稳态燃烧系统和瞬态燃烧系统两部分，分别在柴浦工业大学和千叶大学进行。在稳态燃烧研究中，对高预热空气在两平面平行板风道内的燃烧与圆管内的旋流进行了实验研究。在一维热力学模型中考虑了旋流效应的分析方法。其基本概念是基于涡流加速过程中平均压力恒定的假设和等温膨胀燃烧。这些结果被推广到三维分析，以表明上述假设的有效性。本文对两平面平行板管道内的流动和热场进行了进一步的分析研究，并与以往的实验结果进行了比较。在瞬态燃烧研究中，利用高速FID对燃烧机理进行了研究，通过局部燃料浓度的测量，对等温膨胀燃烧进行了详细的了解。因此，新的研究结果表明，通过控制气体流量和燃油喷射时间，可以在火花塞周围产生适当的可燃混合物。在该区域内，即使在膨胀过程中温度降低，也能保持良好的燃烧状态，从而减少热损失。

The study is consisting of two parts, i.e. Steady State Combustion System and Transient Combustion System (and executed in Shibaura Institute of Technology and Chiba University, respectively.In the steady combustion research, the experimental works have been performed on the combustion with very high preheated air in a duct of two plane parallel plates together with the swirl flow in a circular tube. The analytical approach has been developed to take into account of the swirl flow effect into one dimensional thermodynamic model.The basic concept is based on the assumption of the constant average pressure during the process of swirl flow acceleration and also on the isothermal expansion combustion. These results are extended to the three dimensional analysis to show the validities of the foregoing assumptions.An additional analytical study has been conducted to exhibit the flow and the thermal fields in a duct of two plane parallel plates and to compared with the preceding experimental results.In the transient combustion research, the combustion mechanisms have been investigated to understand the isothermal expansion combustion in details by high speed FID through the local fuel concentration measurement. In consequence, the new findings have been revealed to create the appropriate combustible mixtures around the spark plug through controlling the gas flow and fuel injection timing. In these region, the favorable combustion can be maintained even in the expansion process with temperature decrease which may be resulted in the reduction of hea tlosses.