| Popis: |
The problem of translating the performance of a continuous-flow compressor from one gas to another has become of increasing importance from several viewpoints: (a) Under certain circumstances it may be possible to test compressors in a special test medium which extends the useful range of test stand to high power or speed ranges. (b) It may be desirable to apply a given compressor of known performance to the compression of a different gas. (c) The fundametnal information that has been accumulated over the years for air compressors may be useful in improving the performance of compressors for other gases. For single or small numbers of stages the performance for geometrically similar flow at the compressor inlet can be translated rather easily from one gas to another. For large numbers of blade rows, however, the translation of the performance becomes much more difficult. The methods used, however, would indicate the changes necessary to keep the performance level up when a given compressor is applied to some other gas. The experimental methods used in testing compressors in a closed loop using Freon-12 on the test medium are given. The problems of indicating the purity of the test gas and maintaining the desired operating conditions indicate some of the problems compressor test stands using special test medium may encounter. It does appear that special test medium for compressors should be considered as a long-range fundamental study rather than a “quick-fix” extension of existing test facilities. |
