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Title: Flow Stability Of Critical - Flow Venturi Nozzles
Author: Blent nsal Utkan aliskan Tbitak Gebze Yerleskesi Baris Mah. Dr. Zeki Aca
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Series of CFD (computational fluid dynamics) simulations were performed for C ritical - Flow Venturi N ozzles (CFVN) to investigate the stability of transonic and supersonic shock structures forming within the nozzle geometries. 5 and 1.56 mm throat diameter nozzle s with ISO 9300 form . Investigations we re performed by means of two sets of simulation s . For the fi rst set, nozzle inlet pressure wa s varied from atmospheric to higher values and the nozzle outlet pressure was kept constant at atmospheric conditions. For the second set, nozzle inlet pressure was kept const ant at atmospheric conditions and the nozzle outlet pressure wa s varied from atmospheric to lower pressures . The results fro m both sets of simulations show ed that at high ba ck pressure ratios (BPR) there we re pressure and corresponding flow rate fluctuations exist. While decreasing BPR, amplitude and frequenc y of the pressure fluctuations we re increasing but t he flow rate pulsations disappear at some certain BPR

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