Turbine motor performance characteristics

Figure 4-192 gives the typical performance characteristics of a turbine motor. The example in this figure is a 6-J-in. outside diameter turbine motor having 212 stages and activated by a 10-lb/gal mud flowrate of 400 gal/min. 

Table 4-110 gives the performance characteristics for various circulation flowrates for the 212-stage, 6f-in. outside diameter turbine motor described briefly in Table 4-109 and shown graphically in Figure 4-192. 

The turbine motor whose performance characteristics are given in Table 4-110 is made up of two motor sections with 106 stages in each section. The turbine motor whose performance characteristics are given in Table 4-111 is made up of three motor sections. 

To make up the difference between the expected expander returned power and the required compressor input power. Meruit designed an air system using a commercially available positive-displacement compressor driven by an electric motor in tandem with Meruit s turbocompressor. Meruit designed a family of compressor and expander wheels with var5dng characteristics (specific speed, dimensional ratios, etc.) representing different compromises in providing performance compatible with the DOE specifications. After extensive evaluation, a compressor wheel was chosen to provide a desired pressure curve over a wide range of mass flows, and a turbine wheel was matched to it. The chosen compressor wheel is intended to trade peak efficiency for extended turndown performance. 

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