Design and optimization of a cavitating device for Congo red decolorization: Experimental investigation and CFD simulation

Improving the performance and reducing emissions in a Diesel engine is the single most objective in current research. Various methods of approach have been studied and presented in literature. A novel but not so pursued study is on the performance of a rotating diesel injector. To date, there has been very little study by implementing a rotating injector. Studies have shown an improvement on the performance of an engine, but with a complicated external rotating mechanism. In the present research, a novel self-rotating fuel injector is designed and developed that is expected to improve the performance without the need for a complicated rotating mechanism. The design procedure, CFD simulation along with 3- D printing of a prototype is presented. Numerical modelling and simulation are performed to study the combustion characteristics of the rotating injector viz-a-viz a standard static injector. Comparison based on heat release, efficiency, and emissions are presented. While the proposed 9-hole injector had slight loss in thermal efficiency, the modified 5-hole had a slight increase in thermal efficiency when compared to the static baseline readings. The NOx reduced by 13% and CO increased by 14% compared baseline emissions for the 5-hole version.

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CFD Simulation of the Air Flow Field in the Multi Blade Centrifugal Fan

The Open Mechanical Engineering Journal ◽

10.2174/1874155x01509010769 ◽

2015 ◽

Vol 9 (1) ◽

pp. 769-772

Author(s):

Jiawei Li

Keyword(s):

Flow Field ◽

Cfd Simulation ◽

Design Method ◽

Axial Flow ◽

Centrifugal Fan ◽

Design And Optimization ◽

Optimization Parameters ◽

Complex Models ◽

Number Of Leaves ◽

Inlet Angle

In this paper, the multi blade centrifugal fan parameter CAD/CFD was developed. Before treatment with the traditional design method as the foundation, use AutoCAD as development of the embedded language. The work of this regulation to establish a set of more perfect design and optimization program of axial flow fan in air, improve its economy, and provided a shortcut for energy saving and noise reduction of multi blade centrifugal machine. Also in the establishment and the simplification of complex models, mesh generation, calculation and other aspects of the use of the model to do some beneficial exploration, hoping to provide reference of the similar simulation numerical type. Influence on the performance of multi blade centrifugal fan impeller is the largest parameters such as the blade outlet angle, inlet angle and blade number. As the numerical simulation application in modern design method, in order to improve the performance of pressure air fan as the optimization objective, the optimization of the fan, the fan impeller optimization parameters more reasonable flow field distribution, air pressure with better performance is obtained, and the formula to determine the recommended number of leaves.

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Experimental Investigation, Exergy Analysis, and CFD Simulation of Solar Air Heater Roughened with Artificial V-Shaped Ribs on Absorber Surface Artificial Roughness on Absorber Plate

Springer Proceedings in Energy - Advances in Clean Energy Technologies ◽

10.1007/978-981-16-0235-1_20 ◽

2021 ◽

pp. 235-252

Author(s):

Shri Krishna Mishra ◽

Rahul Kumar ◽

Renu Joshi ◽

Hitesh Kumar ◽

Nishant Saxena

Keyword(s):

Experimental Investigation ◽

Exergy Analysis ◽

Cfd Simulation ◽

Solar Air Heater ◽

Artificial Roughness ◽

Absorber Plate ◽

Air Heater ◽

Absorber Surface

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Use of Numerical Techniques in the Diesel Engine Intake Manifold Optimization

Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B ◽

10.1115/imece2010-37154 ◽

2010 ◽

Author(s):

P. P. Chitnis ◽

S. Juttu ◽

A. G. Deshmukh ◽

K. R. Sampathkumar ◽

N. V. Marathe

Keyword(s):

Experimental Data ◽

Diesel Engine ◽

Cfd Simulation ◽

Engine Performance ◽

Volumetric Efficiency ◽

Intake Manifold ◽

Numerical Techniques ◽

Time Data ◽

Data Simulation ◽

Design And Optimization

This paper is mainly focused on the design and optimization of intake manifold as regards plenum volume, shape and runner length to improve the breathing capacity of NA and TC diesel engines. The main aim of this work is to maximize volumetric efficiency of diesel engine intake manifolds in order to handle high EGR levels and ensure uniform distribution of charge to minimize cylinder-to-cylinder variation. The intake manifold is designed by using numerical techniques and analysis is carried out by employing 1D and 3D CFD simulation tools. The entire engines have been modeled in 1D-code using base manifold dimensions and validated with experimental data. Simulation result shows good agreement with the acquired real-time data of intake and exhaust manifold pressure characteristics particularly during overlap period. Also, basic engine performance, combustion pressure and NOx & Soot emissions predicted are found within 5–10% of the experimental data. This paper presents the work carried out on intake manifold design through case studies on one each NA and TC diesel engine, with and without EGR. The optimized manifold plenum volume for NA engine of approximately 75% (including runners) of swept volume and runner length of 97mm have shown considerable improvement in volumetric efficiency resulting in 2.5% improvement in bsfc. Whereas, plenum volume of 1.45 times engine displacement with same runner length shows more than 3% improvement in bsfc for TCI diesel engine. Further, transient simulation study is carried out using 3D CFD simulation tool for two complete cycles and it is observed that mass flow rate deviation between the runners is reduced to less than 5%. Shape of the runner is also modified to avoid any eddy formation in the flow path. The runner diameter is optimized. Optimization location for EGR entry and modification to runner design is also described in this paper demonstrating uniform EGR distribution with acceptable deviation.

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