Impulsive Loading Noise of a Lift-Offset Coaxial Rotor in High-Speed Forward Flight
نویسندگان
چکیده
منابع مشابه
An Efficient and Robust Method for Predicting Helicopter Rotor High-speed Impulsive Noise
A new formulation for the Ffowcs Williams{ Hawkings quadrupole source, which is valid for a fareld in-plane observer, is presented. The fareld approximation is new and unique in that no further approximation of the quadrupole source strength is made and integrands with r 2 and r 3 dependence are retained. This paper focuses on the development of a retarded-time formulation in which time derivat...
متن کاملParallel Simulation of Lifting Rotor Wakes in Forward Flight
A finite-volume implicit, unsteady, multiblock, multigrid, upwind solver, and structured multiblock grid generator for rotors are presented, and applied to lifting rotors in forward flight. These flows are particularly expensive to compute as the accurate capture of the detailed vortical wake requires fine meshes away from the blades and, hence, a parallel version of the code has been developed...
متن کاملEffects of Impeller Gap on Rotor Vibration in a High Speed Centrifugal Compressor: A Numerical and Experimental Analysis (TECHNICAL NOTE)
Centrifugal compressors produce high pressure ratio and rotate at speeds. So, a tiny unbalance can produce severe vibration. In this paper, effects of impeller gap on rotor vibration in a high speed centrifugal compressor is investigated. For this purpose, a numerical and experimental analysis are carried out. The moving reference frame method in FLUENT software is used for modeling of geometri...
متن کاملMeasurements of the near Wake of a Rotor in Forward Flight
# Graduate Research Assistant, Student Member AIAA * Professor, Associate Fellow AIAA This paper describes initial measurements of the near wake of a 2-bladed teetering, untwisted, squaretipped rotor in forward flight. Issues of periodicity and repeatibility of the core are studied using laser velocimetry and flow-visualization on the front of the rotor wake where cycle to cycle variations are ...
متن کاملCode-to-Code Comparison of CFD/CSD Simulation for a Helicopter Rotor in Forward Flight
Two unsteady Reynolds-averaged Navier-Stokes solvers are used to compute the rotor airloads on the UH-60A rotorcraft at several flight conditions across the flight envelope. One code, OVERFLOW, solves the flow equations using either structured grids, or a combination of structured and Cartesian grids. The other solver, FUN3D, uses unstructured grids. Both flow solvers are coupled to the same ro...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: AIAA Journal
سال: 2020
ISSN: 0001-1452,1533-385X
DOI: 10.2514/1.j058295