Design of a Flow Modulator to Generate Sinusoidal Pressure Oscillations

EasyChair Preprint 6328

Abstract

Sinusoidal pressure oscillations are of great significance for dynamic calibration of transducers, frequency response analysis, pogo studies, dynamic characterization test of pumps, etc. Basic idea of this paper is to demonstrate the generation of oscillating pressure by varying the flow area of a valve poppet, which is a direct function of the poppet position. This paper deals with design of slider crank mechanism to produce the necessary reciprocating motion of the poppet. One of the main challenges in flow modulation is to maintain the sinusoidal nature of the downstream flow oscillations. The system parameters which affect the harmonic distortion of downstream pressure is also dealt with in this text. Scope of this paper includes a lumped fluid system modelling of the flow modulator as a variable-area custom orifice with inlet and outlet pipes in MATLAB-SIMULINK. Frequency analysis of the downstream pressure is done, and the system parameters are tuned to reduce the participation of higher modes and develop near-sinusoid pressure oscillations.

Keyphrases: Flow Modulator, Pressure oscillation, Slider-crank, harmonic distortion, poppet valve

@booklet{EasyChair:6328,
  author    = {Sunny Mitra and Mathew Saxon and Aneesh Rajan and Sajeev Padmanabhan},
  title     = {Design of a Flow Modulator to Generate Sinusoidal Pressure Oscillations},
  howpublished = {EasyChair Preprint 6328},
  year      = {EasyChair, 2021}}