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This technical report is concerned with the effect of flow distribution control on the design and performance of marine gas turbine waste- heat steam generators. Major design requirements and critical problems associated with a waste-heat steam generator were reviewed, and an existing two- dimensional heat exchanger model based on the compact heat exchanger design criteria and the relaxation approach was modified and updated to estimate the waste-heat steam generator performance at any inlet gas flow distribution. Performance estimates were made of the steam generator using a uniform velocity distribution, and also actual flow distribution data available (at the diffuser inlet) with and without flow distribution controls, all at design and off design operating conditions of the gas turbine engine. Results of the study indicate that the exit steam temperature of the baseline waste-heat steam generator with and without flow distribution controls would be 725 F and 450 F, respectively, for a constant design flow rate of 7.9 lb/sec, and for a constant exit temperature of 700 F, the water flow rates would be 8.1 lb/sec and 6.6 lb/sec, respectively. A suggested experimental program to provide information for comparison with the analytical results, and to obtain applicable operational experience is also described in this report., See also Phase 1, AD-A104 560.

Flow-distribution problems have become increasingly important in the design of modern fluid flow and heat transfer systems. The study of flow-distribution characteristics and control of marine gas turbine exhaust flow is the subject of this report. Major technical problems associated with nonuniform-flow distribution were reviewed and various flow-distribution control methods were evaluated. A two-dimensional, turbulent-flow model was developed for investigating flow-distribution characteristics and diffuser performance. The study was based on actual flow-distribution data from marine gas turbine exhaust flows. Results of this study indicate that a more uniformly distributed flow can be obtained by using flow-guide vanes combined with flow injection, and an improvement of approximately 20 to 36 percentage points in diffuser efficiency can be expected depending on the diffuser geometry considered. (Author)

This report presents the technical characteristics of alternative closed-cycle gas turbine propulsion systems incorporating various electrical and mechanical transmissions, and reviews the critical technologies and development requirements for these propulsion systems as part of a comprehensive study program which assesses the technological and economic feasibility of utilizing open- and closed-cycle gas turbines to provide lightweight propulsion power for future Navy capital ship applications. The level of technology considered is that judged by the Contractor to be available for use during the 1990's.

This report presents the results of conceptual design studies and reliability analyses as part of a comprehensive study program to evaluate the technological and economic feasibility of utilizing open- and closed-cycle gas turbines integrated with fossil or nuclear heat sources for providing advanced lightweight propulsion power for future Navy capital ship applications. The level of technology considered is that judged by the Contractor to be available during the 1990's., Includes Rept. no. UTRC/R77-952972-1 dated Nov 77.