| 摘要 |
PURPOSE:To improve thermal efficiency of engine by providing a heat transfer fin on the innercircumferential face at the combustion gas flow-in side of a heater tube surrounding the combustion chamber to heat the operating gas and enabling usage of heater tube under high temperature region. CONSTITUTION:A heater tube 8 for heating the operating gas is arranged while surrounding the combustion chamber. Here, heat transfer fin rod 21 is brazed to the innercircumferential face 23 of said heater tube 8 at the combustion gas flow-in side. Consequently, the ratio of heat transfer area of heater tube 8 at the flow-in side 22 and flow-out side 24 can be modified to 1.2-3. As a result, the temperature distribution of heater tube 8 can be uniformed while the circumferential thermal stress can be reduced to enable usage of heater tube 8 under high temperature region resulting in improvement of engine output and thermal efficiency. |
