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TURBINE ANALYSIS A method for estimating the efficiency for ETI's radial out- flow (ROF) turbine design was needed to be able to evaluate overall power conversion suba,stem performance. Within the program's work scope, it was not possible to do a detailed turbine design for all theparametricRankineenginecombinations. Therefore,ascheme was deyLsed which would give a good rough approximation of the expected turbine performance, A decision was made to use the turbine's last stage as a basis and to compute the performance of that stage utilizing the designexperiencealidtestdataof€TIandothers. Reynolds number was $elected as the best indicator of stage efficiency. In a multi-stage turbine, the energy release per stage generally increases from inlet to exit. As a result, the last stage has the greatest effect on the turbine's overall performance. The four sections that follow describe M e procedure developed for estimating the efficiency of ETI's radial outflow turbine. ASSUMPTIONS (Re, BLADE ANGLE8 T I P SPEED, ETC.) Reynolds number is a dimensionless parameter conunccly used tocorrelateturbineperformance. Experimentalefficiencyvs. Re data was collected to be used as a basis for the turbine cal- culations. Sourcescontainingdatadefiningthecurrentstateof the art in small turbomachinery were selected from this reference pool. ThisdataislistedinFigure3. Muchofthisinformation was obtained from experimental work conducted at the WA-Lewis ResearchCenter. ThereferencesofFigure3defineRewiththe following equation: Re = lJrt This is different from the classical definition of Re, which is usually specified as follows: K The hydraulic diameter (Dh) being defined as: By using the continuity equation (m = p V A ) , the definition of hydraulic diameter from the first R- out, yielding: e equation can be separated Dh 0 =t 4 APDF Image | Radial Outflow Turbine for Solar Steam Rankine Engines
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