Description of an oscillating flow pressure drop test rigA test rig designed to generate heat exchanger pressure drop information under oscillating flow conditions is described. This oscillating flow rig is based on a variable stroke and variable frequency linear drive motor. A frequency capability of 120 hertz and a mean test pressure up to 15 mPA (2200 psi) allows for testing at flow conditions found in modern high specific power Stirling engines. An important design feature of this rig is that it utilizes a single close coupled dynamic pressure transducer to measure the pressure drop across the test sample. This eliminates instrumentation difficulties associated with the pressure sensing lines common to differential pressure transducers. Another feature of the rig is that it utilizes a single displacement piston. This allows for testing of different sample lengths and configurations without hardware modifications. All data acquisition and reduction for the rig is performed with a dedicated personal computer. Thus the overall system design efficiently integrates the testing and data reduction procedures. The design methodology and details of the test rig are described.
Document ID
19890027817
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wood, J. Gary (NASA Lewis Research Center Cleveland, OH, United States)
Miller, Eric L. (Sverdrup Technology, Inc. Cleveland, OH, United States)
Gedeon, David R. (Gedeon Associates Athens, OH, United States)
Koester, Gary E. (Sunpower, Inc. Athens, OH, United States)