Abstract
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.
Highlights
It is estimated that there might have around 1000 small size business jets flying across the world equipped with flow control and regulating shut-off valves with hot wire anemometer devices, as primary and solely air flow measurer device used to regulate the bleed airflow, of both air-conditioning and pressurization systems
Advances in Mechanical Engineering is recognized that the hot wire anemometer device is mostly utilized in static applications destined to laboratory tests, experiments, or industrial applications that require constant recalibration, and it is not commonly used in measurement of higher Mach bleed airflow as in aircraft applications.[1]
The flow control and regulating shutoff valve needs to comply with its reliability requirement as per contract in order not to affect the field operation costs with lower MTBF
Summary
It is estimated that there might have around 1000 small size business jets flying across the world equipped with flow control and regulating shut-off valves with hot wire anemometer devices, as primary and solely air flow measurer device used to regulate the bleed airflow, of both air-conditioning and pressurization systems. Advances in Mechanical Engineering is recognized that the hot wire anemometer device is mostly utilized in static applications destined to laboratory tests, experiments, or industrial applications that require constant recalibration, and it is not commonly used in measurement of higher Mach bleed airflow as in aircraft applications.[1] the hot wire anemometer technology presents complexities and fragilities inherent to its design[1] when combined with the premature removals as reported by field operators, explains the impact in the reliability issues of these small business aircraft.[2]. The flow control and regulating shut-off valve proper operation guarantees a steady mass flow rate into the cabin to avoid the undesirable ear cabin-bumps or abnormal cabin pressure fluctuations (ft/min) that affects passenger comfort.[3,4] It maintains a smooth and constant engine bleed air extraction (lb/min) within the pre-established design level for the entire flight duration,[5] not affecting fuel consumption either
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