Numerical analysis of controlling cavitation instabilities in tandem cascades

Yuka Iga, Yoshiki Yoshida

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Cavitation is an inevitable phenomenon that occurs when improvements such as performance enhancement and weight reduction are made to the turbopump in liquid-propellant rocket engines. Unsteady cavitation may cause oscillations (cavitation instabilities) in the turbopump. Accurate prediction and efficient suppression of cavitation instabilities are important for designing turbopumps. We performed a numerical simulation of the unsteady cavitation in tandem cascades and compared the results with those obtained for a single-stage cascade. The type of cavitation instability could be controlled by changing the front- and rear-blade chord lengths. When the clearance gap between the front and rear blades was located near the cascade throat entrance, rotating-stall conditions could be easily achieved, even at high flow rates. Cavitation surge and super-synchronous and sub-synchronous rotating cavitations were suppressed when the clearance gap was located at 40% of the total chord length. When the clearance gap was located inside the cascade throat, cavitation reached a steady state at the σ value where the cavity length equaled the front-blade length; then, cavitation instabilities and unsteady cavitation were suppressed in the low-σ region.When the clearance gap was located at 80%of the total chord length, cavitation surge was completely suppressed, although rotating cavitation occurred over a larger region.

Original languageEnglish
Pages (from-to)137-143
Number of pages7
JournalTransactions of the Japan Society for Aeronautical and Space Sciences
Issue number184
Publication statusPublished - 2011


  • Cavitation Surge
  • CFD
  • Homogeneous Model
  • Rotating Cavitation
  • Tandem Cascade


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