کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053574 1457610 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intermittency and stochastic modeling of hydrodynamic pressure fluctuations in the near field of compressible jets
ترجمه فارسی عنوان
تلفیق و مدل سازی تصادفی از نوسانات فشار هیدرودینامیکی در میدان نزدیک جت های فشرده
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The intermittent statistics of the pressure fluctuations measured in the near field of a compressible jet are investigated under several flow conditions. An experiment is carried out in a semi-anechoic chamber on a single stream compressible jet at Mach numbers varying from 0.5 to 0.9 and measuring the fluctuating pressure in several positions in the near field. The main quantities analyzed are the intermittent time and the energy amplitude of events that are extracted from the experimental data through a wavelet-based tracking algorithm. As an extension of a previous paper (Camussi et al., 2017), low order statistical moments (mean and variance) and Probability Distribution Functions are parametrized in terms of three relevant quantities characterizing the jet flow physics: the Mach number, the radial distance from the jet axis and the axial position. It is observed that the non-dimensional statistical quantities are weakly dependent upon the flow conditions allowing for simple stochastic models to be introduced on the basis of suitable fittings of averaged statistical properties and of the Probability Distribution Functions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 68, December 2017, Pages 180-188
نویسندگان
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