Anupam Sharma

Assistant Professor

Office: 2341 Howe Hall Phone: 515 294-2884 Email: sharma@iastate.edu

Department(s): Aerospace Engineering.

Research Interests: Aeroacoustics, wind turbine aerodynamics and noise, and high performance computing.

Current Research: Dr. Sharma's research group conducts research in the areas of aerodynamically generated noise in turbomachines and wind turbine aerodynamics.

Turbomachinery Noise: All engineering machines produce noise, usually as a byproduct. My particular focus is on noise generated by turbomachines – aircraft engines, power generation machines etc. Aerodynamic noise arises from fluid flow and its interaction with solid bodies. In a turbomachine, there are multiple sources that produce noise. We are currently investigating the following problems: broadband noise from high-bass aircraft engine fans, open rotor noise, and multiple pure tone noise.

Wind Turbine Aerodynamics: The well-known Betz limit of aerodynamic power coefficient, CP of 0.593 for a horizontal axis wind turbine (HAWT) is misleading, as it assumes no swirl losses, infinite number of blades, and inviscid flow approximations. When those are accounted for, the CP entitlement is closer to 0.53. A modern HAWT is within a few percentage points of this value! In contrast, the same turbine operating in a farm may incur as much as 40% additional losses due to the aerodynamic interaction between the turbines. My group is exploring means of assessing the losses in a wind turbine farm as well as impact of such aerodynamic interactions on low-frequency noise from turbines.

Recent Publications:

Sharma, Anupam, and Hsuan-nien Chen, 2013: Prediction of tonal aerodynamic noise from open rotors. Journal of Sound and Vibration, 332(16), 3832–3845.

Paliath, Umesh, Fei Han, Chingwei M. Shieh, and Anupam Sharma, 2010: Multiple pure tone noise prediction for acoustically treated aircraft engines. Proceedings, 16th AIAA/CEAS Aeroacoustics Conference, Stockholm, Sweden, American Institute of Aeronautics and Astronautics, Paper 2010-3714.

Sharma, A., F. Taghaddosi, A. Gupta, A. Gopinath, M.E. Braaten, and S. Herr, 2010: Diagnosis of aerodynamic losses in the root region of a horizontal axis wind turbine. Technical Report, General Electric Global Research Center.

Sharma, Anupam, Simon K. Richards, Trevor H. Wood, and Chingwei M. Shieh, 2009: Numerical prediction of fan tone interaction noise from high bypass aircraft engines. American Institute of Aeronautics and Astronautics Journal, 47(12), 2866-2878.

Sharma, Anupam, and Lyle N. Long, 2004: Numerical simulation of the blast impact problem using the Direct Simulation Monte Carlo (DSMC) method. Journal of Computational Physics, 200(1), 211–237.

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