A method of extracting smoke from buildings using a water-air jet pump

A mathematical model to predict the air-solids performance of central air-jet pumps has been developed based on the fundamentals of fluid and particle mechanics. The influence of throat entry configuration on performance has been incorporated into the analytical model by introducing a throat entry function and suction area ratio. Nondimensional parameters to represent air-solids jet pump performance has been defined and used in the analytical procedure. The performance predictions obtained by this model show good agreement with experimental results.

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CFD Driven Parametric Design of Air-Air Jet Pump for Automotive Carbon Canister Purging

SAE International Journal of Passenger Cars - Mechanical Systems ◽

10.4271/2017-01-1316 ◽

2017 ◽

Vol 10 (2) ◽

pp. 474-486 ◽

Cited By ~ 1

Author(s):

Dhaval Vaishnav ◽

Mohsen Ehteshami ◽

Vylace Collins ◽

Syed Ali ◽

Alan Gregory ◽

...

Keyword(s):

Parametric Design ◽

Jet Pump ◽

Air Jet

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AN EXPERIMENTAL ANALYSIS OF LIQUID AIR JET PUMP

Frontiers in Heat and Mass Transfer ◽

10.5098/hmt.17.12 ◽

2021 ◽

Vol 17 ◽

Author(s):

V. W. Bhatkar ◽

Anirban Sur

Keyword(s):

Experimental Analysis ◽

Jet Pump ◽

Air Jet

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Numerical Investigation of Geometric Factors for Design of High Performance Air-Jet Pumps Using in Vehicle-Mounted Vacuum Toilet

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.268-270.46 ◽

2011 ◽

Vol 268-270 ◽

pp. 46-50

Author(s):

Fei Gao ◽

Jing Xuan Zhou ◽

Min Li

Keyword(s):

High Performance ◽

Operating Conditions ◽

Cfd Model ◽

Jet Pump ◽

Air Jet ◽

Geometric Factors ◽

Constant Area ◽

Jet Pumps ◽

Computational Fluid Dynamics Cfd ◽

Area Section

Air-jet pump as the pneumatic source of a vehicle-mounted vacuum toilet provides the vacuum to pump the fecal sewage out of toilet bowl via the compressed air passing through the pump under certain pressure. In this study, Computational Fluid Dynamics (CFD) technique is employed to investigate the effects of three important air-jet pump geometry parameters: the primary Nozzle Exit Position (NXP), the constant-area section length (L1) and the diffuser diverging angle (θ), on its performance. A CFD model is firstly established according to 1D analytical method, and then used to create 135 different air-jet pump geometries and tested under different operating conditions. The significance of this study is that these findings can be used to guide the adjustment of NXP, L1 and θ to obtain the best air-jet pump performance when the operating conditions are different.

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Numerical analysis of an annular water–air jet pump with self-induced oscillation mixing chamber

The Journal of Computational Multiphase Flows ◽

10.1177/1757482x16688476 ◽

2017 ◽

Vol 9 (1) ◽

pp. 47-53 ◽

Cited By ~ 3

Author(s):

Xiaogang Deng ◽

Jingliang Dong ◽

Zhentao Wang ◽

Jiyuan Tu

Keyword(s):

Transient Flow ◽

Flow Analysis ◽

Phase Interface ◽

Internal Flow ◽

Numerical Comparison ◽

Concept Design ◽

Jet Pump ◽

Operational Conditions ◽

Air Jet ◽

Mixing Chamber

This paper presents an improved annular water–air jet pump concept design through integrating a self-induced oscillation mixing chamber with the conventional annular jet pump (AJP). The internal flow characteristics for both conventional and improved AJP were numerically investigated and compared by a validated computational fluid dynamics model. The numerical comparison demonstrated an approximately 10% pumping performance increase compared with the conventional pump, which is mostly attributed to the improved mass and energy transfer along the oscillating phase interface. Furthermore, transient flow analysis was conducted to resolve the unsteady self-introduced oscillation. The results revealed the self-introduced oscillation induces a continuous break-up and formation of fresh water–air interfaces, which exhibits a periodic feature with a dominant frequency of 147 Hz for the current design under given operational conditions. This study contributes toward a better understanding of the internal annular water–air jet pump flow patterns, and also demonstrates the feasibility of incorporating self-introduced oscillation chamber into AJP design.

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