This paper states that there might have around 1000 small size business jets (until nine occupants) flying across the world equipped with flow control and regulating shut-off valves that uses hot wire anemometer devices to regulate massflow rate from the bleed airflow to supply the air-conditioning and pressurization systems. However, these valves present low reliability in the field. The purpose of this paper is to evaluate the implications of a flow control and regulating shut-off valve with a non-intrusive airflow measurer device under the perspective of fluid mechanics. The Venturi technology that is commonly used technology, given its construction simplicity, precision, and broad use in the industry, is selected to substitute the flow control and regulating shut-off valves with hot wire anemometer of the mentioned small size business jets applications. This paper has adopted a numeric simulation approach utilizing the ANSYS-CFX computational fluid dynamics software to verify both the differential pressure at the Venturi device and its correspondent mass flow rate to supply the air conditioning systems of some small size business jets, considering the mass-flow rate as requested by the FAA certification requirement (0.55 lb/min per occupant). This paper shows that a mass-flow rate control and regulating shut-off valve with a Venturi device, of 1 inch and β of 0.67, is compliant with the minimum fresh air flow requested by the FAA certification requirement to operate in some small size business jets. Besides that, the software ANSYS-CFX is also effective to support the engineering analysis of flow field characteristics inherent to the applications of internal compressible flow. The numeric simulation utilizing the ANSYS-CFX computational fluid dynamics software outlined herein can lay the basis for further research related to the design of a flow control and regulating shut-off valves with a Venturi device.

本文指出，可能有大约 1000 架小型商务喷气机（最多可容纳 9 名乘客）在世界各地飞行，配备流量控制和调节截止阀，使用热线风速计装置调节来自引气的质量流量以供应空气- 调节和加压系统。然而，这些阀在现场的可靠性较低。本文的目的是从流体力学的角度评估带有非侵入式气流测量装置的流量控制和调节截止阀的含义。文丘里技术是一种常用的技术，鉴于其构造简单、精确且在行业中的广泛应用，被选择用上述小型公务机应用的热线风速计代替流量控制和调节截止阀。本文采用数值模拟方法，利用 ANSYS-CFX 计算流体动力学软件验证文丘里装置处的压差及其相应的质量流量，以供应一些小型公务机的空调系统，考虑质量 - FAA 认证要求所要求的流量（每位乘员 0.55 磅/分钟）。本文表明，带有文丘里装置的质量流量控制和调节截止阀，尺寸为 1 英寸，β 值为 0.67，符合 FAA 认证要求的最小新鲜空气流量，以便在一些小型企业中运行喷气式飞机。除此之外，ANSYS-CFX 软件还可以有效地支持内部可压缩流应用所固有的流场特性的工程分析。此处概述的使用 ANSYS-CFX 计算流体动力学软件的数值模拟可为与文丘里装置的流量控制和调节截止阀的设计相关的进一步研究奠定基础。