Flowfield analysis of ducted-fan

Yih Ru Jiang, Shih H. Chen

Research output: Contribution to journalArticlepeer-review


An efficient method to calculate the flow field of fan blades is developed in the present study. The numerical method developed is a source and doublet based panel method similar to that of Morino's. The source term can be determined from the non-penetrating boundary condition once the fan geometry and motion are given. The unknown doublet term can thus be obtained solving simultaneous linear algebraic equations. The pressure field, velocity, fan efficiency, force and power etc. can be calculated once the velocity potentials are obtained. The results show that the thrust and power are increased when the duct is added to the fan. This is because that the tip vortex strength is reduced and the flow field becomes nearly two-dimensional at the tip. The present study shows that the method used in fan blade analysis (with or without duct) is accurate and efficient. It can be an useful and robust tool for fan blade designs.

Original languageEnglish
Pages (from-to)11-21
Number of pages11
JournalTransactions of the Aeronautical and Astronautical Society of the Republic of China
Issue number1
Publication statusPublished - 1999 Mar 1

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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