orifice flow meter
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Aerospace ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 39
Author(s):  
Hideyuki Taguchi ◽  
Kenya Harada ◽  
Hiroaki Kobayashi ◽  
Motoyuki Hongoh ◽  
Daisaku Masaki ◽  
...  

This study investigated a pre-cooled turbojet engine for a Mach 5 class hypersonic transport aircraft. The engine was demonstrated under takeoff and Mach 2 flight conditions, and a Mach 5 propulsion wind tunnel test is planned. The engine is composed of a pre-cooler, a core engine, and an afterburner. The engine was tested under simulated Mach 4 conditions using an air supply facility. High-temperature air under high pressure was supplied to the engine components through an airflow control valve and an orifice flow meter, and liquid hydrogen was supplied to the pre-cooler and the core engine. The results confirmed that the starting sequence of the engine components was effective under simulated Mach 4 conditions using liquid hydrogen fuel. The pre-cooling effect caused no damage to the rotating parts of the core engine in the experiment.


Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7281
Author(s):  
Adam Tomaszewski ◽  
Tomasz Przybylinski ◽  
Marcin Lackowski

The paper presents the results of the experimental and numerical analysis of a six-hole orifice flow meter. The experiments were performed on humid air in a 100 mm diameter duct. The aim of this research was to investigate the mass flow and pressure drop dependency in an orifice of a predetermined shape and to compare the results obtained with computational formulas recommended in the ISO 5167-2 standard for a single-hole orifice flow meter. The experiments and calculations were performed on several multi-hole orifice geometries with different contraction coefficient in a wide range of Reynolds numbers. The pressure was probed immediately upstream and downstream of the orifice. The flow coefficient determined for the six-hole orifice flow meter investigated was compared with the flow coefficient of conventional single-hole orifice with the same contraction coefficient. The results from computational formulas for single-hole orifice from ISO 5167 are also included in the paper. During some experiments, an obstacle has been introduced in the duct at variable distance upstream from the orifice. The effect of the thus generated velocity field disturbance on the measured pressure drop was then investigated. Numerical simulation of the flow with the presence of the obstacle was also performed and compared with experimental data.


Author(s):  
Hamzeh Ghorbani ◽  
David A. Wood ◽  
Abouzar Choubineh ◽  
Afshin Tatar ◽  
Pejman Ghazaeipour Abarghoyi ◽  
...  

Author(s):  
YiQin Xu ◽  
Daniel Coxe ◽  
Yulia Peet ◽  
Taewoo Lee

This study is concerned with understanding and improvement of mass flow rate measurement uncertainty and errors encountered at low flow rates and start-up in commercially available flow rate measurement devices, such as orifice flow meters. The flow through a typical cylindrical flange-tapped orifice flow meter is modeled computationally so the actual mass flow rate is known a-priori. Empirical predictions from the reading of “virtual” pressure sensors are compared with the actual flow rate and the measurement errors are quantified and analyzed. Commercial code ANSYS-Fluent is compared in this study to the in-house high-fidelity spectral-element solver Nek5000, so that conclusions about the applicability of a commercial code to the calculations of measurement uncertainty in the orifice flow meters can be made.


2017 ◽  
Vol 123 ◽  
pp. 107-110 ◽  
Author(s):  
Akifumi Iwamoto ◽  
Minoru Nobutoki ◽  
Takuya Kumaki ◽  
Haruhiro Higaki ◽  
Shinji Hamaguchi ◽  
...  

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