摘要: The advent of the marine gas turbine provided surface ships a propulsion plant offering mechanical reliability and flexibility of operation not found in conventional steam plants. Several problems, however, have developed for surf... 展开 The advent of the marine gas turbine provided surface ships a propulsion plant offering mechanical reliability and flexibility of operation not found in conventional steam plants. Several problems, however, have developed for surface vessels via this technology. Mass flow rates four to five times their steam counterpart and exhaust temperatures in the vicinity of 950 F have lead to considerable research. This thesis used a computer aided data acquisition system in the study of the effect of mass flow on exhaust stack eductor performance. Pressure and temperature data was acquired via a Hewlett-Packard data scanner and a scanivalve was used to aid in pressure data acquisition. Verification runs were conducted on a previously tested model with known performance characteristics with favorable results. Model diffuser ring geometry was altered to enhance film cooling and avoid local hot spots noticed in previous research. Uptake Mach numbers were varied between 0.06 and 0.024. The eductor pumping coefficient was found to increase from 0.6 to 0.69 respectively. Shroud and diffuser ring temperatures varied slightly with Mach number, however temperatures noticed were lower than those reported earlier due to the increased performance of the eductor. 收起