A Method to Design and Optimize Axial Flow Cyclones for Gas-Liquid Separation

2021 ◽  
Author(s):  
Kyle Anderson ◽  
Xiang Zhang ◽  
Bahman Abbasi
Keyword(s):  
Performance Optimization ◽  
Collection Efficiency ◽  
Axial Flow ◽  
Design Parameters ◽  
Liquid Separation ◽  
Water Separation ◽  
Air Mass ◽  
Water Collection ◽  
Mass Flowrate ◽  
And Performance

Abstract This paper provides a detailed design guide, optimization, and performance assessment for air-water separation of an axial flow cyclone. Axial flow cyclones (also known as swirl tube demisters, mist eliminators, or Austin-Write cyclones) have a range of applications in several different industries. This method of gas-liquid separation offers many benefits. Among these are high separation efficiency in high pressure applications (over 90% at 1 MPa) and an inline design that allows them to be more easily fitted into existing piping structures. Despite these benefits, there is a lack of recent literature on their design criteria and performance optimization. This research fills the gap in the literature by quantifying the effect of design parameters on water collection efficiency, ?_(water collection), and the air bypass efficiency, ?_(air bypass), defined as the ratio of the air mass flowrate exiting through the desired air outlet over the inlet air mass flowrate. A set of wide-ranging experiments were conducted to study the effects of gas-liquid flow rates, tube geometry, and relative injection angles to optimize water collection and air bypass efficiencies. The water collection efficiency exceeded 99.8% when the liquid streamline came in direct contact with the water drainage exit. An empirical correlation was developed to predict the swirl pitch as a function of the above design parameters. Predictions from the correlation were within 10% of the experimental results. The correlation can be used to design highly efficient in-line gas-liquid separators.

A New Approach to Evaluate and Optimize Swirl Tube Demister Efficiency

2020 ◽  
Author(s):  
Kyle Anderson ◽  
Ben Reinhardt ◽  
Walead Sultani ◽  
Hannah O' Hern ◽  
Xiang Zhang ◽  
...  
Keyword(s):  
Water Purification ◽  
Separation Efficiency ◽  
Collection Efficiency ◽  
Design Parameters ◽  
Clear Trend ◽  
Water Separation ◽  
Air Mass ◽  
Water Collection ◽  
Mass Flowrate ◽  
Water Ratio

Abstract The focus of this report is on a new technique to quantify the air-water separation efficiency of a swirl tube demister that has application in numerous water purification systems. This experimental study adds to the existing literature by quantifying the effect of design parameters on both the previously studied water collection efficiency, as well as the air bypass efficiency, defined as the ratio of the air mass flowrate exiting at the desired air outlet, over the inlet air mass flowrate. This parameter is important for the water purification field because air acts as a carrier of contaminants, necessitating that it does not leak into the purified water collection chamber. Results from this study showed there was a clear trend when comparing the air bypass efficiency to the inlet air to water ratio. As the inlet air to water ratio increased, the air bypass efficiency decreased. This trend was consistent among four different experimental apparatuses indicating that either the geometry of the swirl tube had very little effect of the air bypass efficiency, or that the ranges tested for dimensions thought to affect the swirl tube performance were not varied enough.

Improved Particle Swarm Optimization (PSO) for Performance Optimization of Electronic Filter Circuit Designs

2012 ◽  
Vol 229-231 ◽  
pp. 1643-1650
Author(s):  
Chong Woon Kien ◽  
Neoh Siew Chin
Keyword(s):  
Particle Swarm Optimization ◽  
Performance Optimization ◽  
Particle Swarm ◽  
Design Parameters ◽  
Pass Band ◽  
Swarm Optimization ◽  
Pass Filter ◽  
High Pass Filter ◽  
And Performance ◽  
High Pass

This article discusses and analyzes particle swarm optimization (PSO) approach in the design and performance optimization of a 4th-order Sallen Key high pass filter. Three types of particle swarm features are studied: basic PSO, PSO with regrouped particles (PSO-RP) and PSO with diversity embedded regrouped particles (PSO-DRP). PSO-RP and PSO-DRP are proposed to solve the stagnation problem of basic PSO. Based on the developed PSO approaches, LTspice is employed as the circuit simulator for the performance investigation of the designed filter. In this paper, 12 design parameters of the Sallen Key high pass filter are optimized to satisfy the required constraints and specifications on gain, cut-off frequency, and pass band ripples. Overall results show that PSO with diversity embedded regrouped particles improve the conventional search of basic PSO and has managed to achieve the design objectives.

Further Effects of Water Ingestion on Axial Flow Compressors and Aeroengines at Part Speed

2008 ◽  
Author(s):  
John Williams
Keyword(s):  
Axial Flow ◽  
Pressure Rise ◽  
Heavy Rain ◽  
Air Mass ◽  
Water Ingestion ◽  
Mass Flowrate ◽  
Dry Conditions ◽  
Surge Line ◽  
Stage Performance ◽  
Bypass Ratio

Further experimental work is reported on the effects of water ingestion on the performance of an axial flow compressor. The background to the work is the effect that heavy rain has on a high bypass ratio aeroengine compressor when operating at “descent idle” power, i.e., when the compressor is operating at part speed and when the aero-mechanical effects of water ingestion are more important than the thermodynamic effects. The current work presents direct measurements on a low-speed four stage laboratory compressor and shows how the surge line is only adversely affected by water ingestion when the stall initiating stage is adversely affected. For a compressor operating at part speed, it is generally the first stage that initiates stall, and the laboratory compressor was consistent with this. When water was injected into the laboratory compressor inlet from straight jet or low fan angle nozzles at mid-span, the first stage performance (unlike later stage performance) was scarcely different from under dry conditions. With water-to-air mass flowrate ratios of up to 20% at the stall point, the overall total-to-static pressure rise was reduced but the stall point remained on the throttle line passing through the stall point of the dry characteristic. This implies no movement of the surge line and results from the near-casing region of the first stage remaining relatively dry, due to the high axial momentum of the water taking it through the rotor blade row without being centrifuged to the casing. In contrast, tests with atomising nozzles producing low axial momentum fine droplets over the whole inlet area, and tests spraying water directly onto the compressor casing ahead of the inlet showed significant adverse effects on both stage one (and later stage) performance and the compressor surge line. The similarity between these latter two sets of test results is consistent with the known dominance of the near-casing region in determining compressor performance with water ingestion. The tests with the atomising nozzles, i.e. all stages affected by water, are most engine-representative. By combining the measured movements of the surge line with the measured increases in driving torque, and considering choked HP and IP turbines, the results are applied to a generic high bypass ratio engine with four stage HP compressor operating at idle speed. The HP compressor is predicted to stall with a core water-to-air mass flowrate ratio of just 2.5%.

scholarly journals Numerical Simulation of New Axial Flow Gas-Liquid Separator

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 64
Author(s):  
Jie Kou ◽  
Zhaoyang Li
Keyword(s):  
Numerical Simulation ◽  
Guide Vane ◽  
Concentration Field ◽  
Tangential Velocity ◽  
Axial Flow ◽  
Liquid Separation ◽  
Water Separation ◽  
Left Wall ◽  
The Right ◽  
Liquid Separator

At present, most of the incoming liquids from the oilfield combined stations are not pre-separated for natural gas, which makes the subsequent process of oil-water separation less effective. Therefore, it is necessary to carry out gas-liquid separation. A new type of axial flow gas-liquid separator was proposed in this paper. The numerical simulation was carried out by CFD FLUENT software, and the changes of concentration field, velocity field and pressure field in the axial flow gas-liquid separator were analyzed. It was found that there were gas-liquid separation developments and stabilization segments in the inner cylinder of the separator. The axial velocity will form a zero-speed envelope in the inner cylinder, and the direction of the velocity in front of and behind the zero-speed envelope was opposite. The tangential velocity showed a “W” shape distribution in the radial position of the inner cylinder. The pressure on the left wall of the guide vane was higher than that on the right side. Therefore, the left wall was more likely to be damaged than the right wall.

Conceptual Design for the Performance Optimization of Compound Coaxial Helicopter

2016 ◽  
Vol 826 ◽  
pp. 40-44 ◽  
Author(s):  
Fei Cao ◽  
Ming Chen ◽  
Mei Li Wen Wu
Keyword(s):  
Conceptual Design ◽  
Performance Optimization ◽  
Design Method ◽  
Aircraft Design ◽  
Design Parameters ◽  
Design Work ◽  
Design And Optimization ◽  
Conceptual Design Phase ◽  
And Performance ◽  
Coaxial Helicopter

The purpose of this paper is to study the conceptual design and optimization of a compound coaxial helicopter. At the conceptual design phase, the compound coaxial helicopter design work was based on the conventional helicopter and fix-wing aircraft design method. The intersection of these aspects makes the design work more complex, thus, a program for the sizing and performance optimization was developed for the aircraft. The program included the total weight design, aerodynamic analysis, flight dynamics analysis, performance calculation and particle swarm optimization analysis. Under the restricted condition of the flight performance requirements, optimize the design parameters which make the weight efficiency factor decrease. Therefore, the study of optimum design process was warranted.

Summary of Experimental Investigation of Three Axial-Flow Pump Rotors Tested in Water

1967 ◽  
Vol 89 (4) ◽  
pp. 589-599 ◽  
Author(s):  
M. J. Miller ◽  
J. E. Crouse ◽  
D. M. Sandercock
Keyword(s):  
Three Dimensional ◽  
Axial Flow ◽  
Flow Coefficient ◽  
Design Parameters ◽  
Flow Conditions ◽  
Unstable Flow ◽  
Axial Flow Pump ◽  
And Performance ◽  
Loading Parameter ◽  
Tip Radius

Three rotors were tested, to study flow and performance across loaded axial-flow blade rows. Principal design parameters varied were flow coefficient (0.29 < φ < 0.45), blade loading parameter at tip (0.25 < Dt < 0.66), and hub-tip radius ratio (0.4 < rh/rt < 0.8). Overall and blade element performances under noncavitating flow conditions are discussed in detail. Comparisons between the measured, three-dimensional design parameters and those computed from two-dimensional cascade correlations are made. A limited amount of performance obtained during operation of the rotors in unstable flow and cavitating flow conditions is presented.

Power and efficiency optimization for combined Brayton and two parallel inverse Brayton cycles. Part 2: Performance optimization

2008 ◽  
Vol 222 (3) ◽  
pp. 405-413 ◽  
Author(s):  
W Zhang ◽  
L Chen ◽  
F Sun
Keyword(s):  
Conversion Efficiency ◽  
Power Output ◽  
Performance Optimization ◽  
Pressure Ratio ◽  
Thermal Conversion ◽  
Design Parameters ◽  
Flow Area ◽  
Compressor Inlet ◽  
Mass Flowrate ◽  
Top Cycle

The power and efficiency of the open combined Brayton and two parallel inverse Brayton cycles are analysed and optimized based on the model established using finite-time thermodynamics in Part 1 of the current paper by adjusting the compressor inlet pressure of the two parallel inverse Brayton cycles, the mass flowrate and the distribution of pressure losses along the flow path. It is shown that the power output has a maximum with respect to the compressor inlet pressures of the two parallel inverse Brayton cycles, the air mass flowrate or any of the overall pressure drops, and the maximized power output has an additional maximum with respect to the compressor pressure ratio of the top cycle. The power output and the thermal conversion efficiency have the maximum values when the mass flowrates of the first and the second inverse Brayton cycles are the same. When the optimization is performed with the constraints of a fixed fuel flowrate and the power plant size, the power output and thermal conversion efficiency can be maximized again by properly allocating the fixed overall flow area among the compressor inlet of the top cycle and the turbine outlets of the two parallel inverse Brayton cycles. The numerical examples show the effects of design parameters on the power output and heat conversion efficiency.

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