5_MAE 334Woodward - lab 4

5_MAE 334Woodward- - MAE 334 Lab 4 2 In the discharge transients a lightly damped oscillation commonly appears and should be noticeable in at least

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MAE 334 Lab 4 2. In the discharge transients, a lightly damped oscillation commonly appears and should be noticeable in at least one of your discharge results. What is the frequency of this oscillation as seen in your data? It has been suggested that this oscillation results from an “organ pipe effect” associated with a “standing wave” from one end of the longer tube to the other (closed end / open end). Calculate this resonant frequency (indicate your reference). How does it compare to your oscillation frequency? 3. In addition to pipe resonance, other complicating factors can influence the apparently simple discharge event that you have studied. The solenoid valve does not open instantaneously. The transducer itself has a resonant diaphragm frequency. The fluid flow during the discharge is clearly compressible and perhaps a “choked” flow. The pressure gage (with its Bourdon tube) represents an isolated volume that flows into the main volume. The compressible air has a capacitance that is naturally pressure dependent. Pick one of these effects and
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This document was uploaded on 01/03/2011.

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