| 摘要 |
Injection apparatus is provided for injecting a drive fluid, such as liquefied nitrogen, into the working chamber ( 50 ) of a cryogenic engine. Liquefied nitrogen is admitted to a housing ( 36 ) of the apparatus under the control of an inlet valve ( 42 ) and expelled from the housing ( 36 ) under the control of an outlet valve ( 48 ). In the housing ( 36 ), heat is transferred to the liquid nitrogen to cause a small volume of the liquefied nitrogen to boil and thereby inject the drive fluid into the cryogenic engine under pressure. In each of two embodiments (FIGS. 1 to 7 ) the liquid nitrogen is transferred to a warmed region of the housing by a moveable injection member ( 4, 20 ) and in two further embodiments the housing is formed as a heat exchanger through which the nitrogen passes.
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