Experimental investigation of spilling fire spread over steady flow n ‐butanol fuel: Effects of flow speed and spreading direction

2019 ◽  
Vol 39 (3) ◽  
Author(s):  
Yang Pan ◽  
Manhou Li ◽  
Changjian Wang ◽  
Xinjiao Luo ◽  
Qiuting Luo
Keyword(s):  
Experimental Investigation ◽  
Steady Flow ◽  
Fire Spread ◽  
Flow Speed ◽  
Fuel Effects

An Experimental Investigation of the Non-Steady Flow Characteristics of a Centrifugal Compressor

1965 ◽  
Vol 180 (1) ◽  
pp. 641-672 ◽  
Author(s):  
R. S. Benson ◽  
A. Whitfield
Keyword(s):  
Experimental Investigation ◽  
Steady Flow ◽  
Mass Flow ◽  
Centrifugal Compressor ◽  
Flow Characteristics ◽  
Flow Conditions ◽  
Rotary Valve ◽  
Low Frequencies ◽  
Pipe System ◽  
Compressor Efficiency

The results are given of an experimental investigation of the flow characteristics of a centrifugal compressor under non-steady flow conditions. The compressor delivered air against a rotary valve with a tee branch located in the pipe system between the compressor and the rotary valve. By varying the areas of a nozzle located at the branch end and orifices in the rotary valve a range of flow conditions could be explored. The tests showed that the surge point was displaced to a point of greater mass flow (thus reducing the flow range of the compressor); the magnitude of the displacement depended on the frequency and amplitude of the pressure pulses. Except for small fluctuations in pressure the overall compressor efficiency was reduced for all the test conditions. The flow characteristic of the compressor, as represented by the pressure-mass flow curves, were displaced under all conditions of pulsating flow, the greatest deviation from steady flow characteristics occurring with largest fluctuations in rotary valve area and at low frequencies.

scholarly journals Numerical and Experimental Investigation of Fuel Effects on Knock Occurrence and Combustion Noise in a 2-Stroke Engine

2012 ◽  
Vol 5 (2) ◽  
pp. 674-695 ◽  
Author(s):  
Fabio Bozza ◽  
Stefano Fontanesi ◽  
Alfredo Gimelli ◽  
Elena Severi ◽  
Daniela Siano
Keyword(s):  
Experimental Investigation ◽  
Combustion Noise ◽  
Fuel Effects ◽  
Stroke Engine

Analysis of heat transfer of spilling fire spread over steady flow of n-butanol fuel

2020 ◽  
Vol 116 ◽  
pp. 104685
Author(s):  
Yang Pan ◽  
Manhou Li ◽  
Xinjiao Luo ◽  
Changjian Wang ◽  
Qiuting Luo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Steady Flow ◽  
Fire Spread

Experimental Investigation on Enhancive Effect of Hydrodynamic Cavitation

2013 ◽  
Vol 781-784 ◽  
pp. 2865-2869
Author(s):  
Jie Deng ◽  
Ai He Wang ◽  
Cai Wen Wang
Keyword(s):  
Methylene Blue ◽  
Experimental Investigation ◽  
Free Radicals ◽  
Water Flow ◽  
Flow Speed ◽  
Cavitation Number ◽  
Hydrodynamic Cavitation ◽  
Experimental Unit ◽  
Operating Parameters ◽  
Pressure Discharge

Based on the principle of hydraulics,an effective equipment of hydrodynamic cavitation is designed and built in this paper.The orifice plates with various geometry size were used as hydrodynamic cavitation generator to study the relation ship between many factor,such as,inlet pressure,discharge,flow speed in orifice,and the cavitation number.Analysis of water flow cavitation status for the experimental unit,this device can produce cavitation phenomenon.The methylene blue and spectrophotometer method can capture the free radicals generated successfully.This is an effective way to measuring the free radicals quantitatively in cavitation,moreover it is easy to fulfill.The intensity of cavitation increases with reduction in the cavitation number.By analyzing the influence of cavitation number on concentrations of •OH.It would be strength of hydrodynamic cavitation.The effect of operating parameters,such as inlet press,low speed in orifice and optimum the structure of hydrodynamic cavitation,best condition of the hydrodynamic cavitation is the inlet press、flow speed in orifice 14 m/s、 0.07.

Effect of End Plates on the Performance of an Impulse Turbine for Wave Energy Conversion

2007 ◽  
Author(s):  
Toshiaki Setoguchi ◽  
Manabu Takao ◽  
Kenji Kaneko ◽  
Shuichi Nagata ◽  
Kazutaka Toyota
Keyword(s):  
Experimental Investigation ◽  
Energy Conversion ◽  
Steady Flow ◽  
Wave Energy ◽  
Model Testing ◽  
Wave Energy Conversion ◽  
Flow Conditions ◽  
Impulse Turbine ◽  
End Plate ◽  
Plate Size

The objective of this paper is to present the effect of end plate on the performances of the impulse turbine for wave energy conversion by experimental investigation. The experiments have been performed by model testing under steady flow conditions in the study. And then, the performances of the impulse turbine with end plates have been compared with those of the original impulse turbine, i.e., the impulse turbine without end plate. As a result, it is found that the characteristics of the impulse turbine with end plates are superior to those of the original impulse turbine. Furthermore, the effects of end plate size and penetration on the turbine characteristics have been clarified in the study.

Instabilities and constitutive modelling

2006 ◽  
Vol 364 (1849) ◽  
pp. 3267-3283 ◽  
Author(s):  
Helen J Wilson
Keyword(s):  
Steady Flow ◽  
Constitutive Relation ◽  
Qualitative Difference ◽  
Constitutive Models ◽  
Flow Speed ◽  
Constitutive Modelling ◽  
Production Lines ◽  
Small Change ◽  
The Stability ◽  
Simple Flows

The plastics industry today sees huge wastage through product defects caused by unstable flows during the manufacturing process. In addition, many production lines are throughput-limited by a flow speed threshold above which the process becomes unstable. Therefore, it is critically important to understand the mechanisms behind these instabilities. In order to investigate the flow of a molten plastic, the first step is a model of the liquid itself, a relation between its current stress and its flow history called a constitutive relation. These are derived in many ways and tested on several benchmark flows, but rarely is the stability of the model used as a criterion for selection. The relationship between the constitutive model and the stability properties of even simple flows is not yet well understood. We show that in one case a small change to the model, which does not affect the steady flow behaviour, entirely removes a known instability. In another, a change that makes a qualitative difference to the steady flow makes only tiny changes to the stability. The long-term vision of this research is to exactly quantify what are the important properties of a constitutive relation as far as stability is concerned. If we could understand that, not only could very simple stability experiments be used to choose the best constitutive models for a particular material, but our ability to predict and avoid wasteful industrial instabilities would also be vastly improved.

scholarly journals Numerical and Experimental Investigation on the Optical Manipulation from an Axicon Lensed Fiber

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 187
Author(s):  
Wu Zhang ◽  
Yanxiao Lin ◽  
Yusong Gao ◽  
Zekai Guo ◽  
Xiangling Li ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Fluid Flow ◽  
Optical Trapping ◽  
Incident Light ◽  
Microfluidic Channel ◽  
Flow Speed ◽  
Optical Force ◽  
Optical Manipulation ◽  
Incident Wavelength ◽  
Polystyrene Microsphere

Here we numerically and experimentally studied the optical trapping on a microsphere from an axicon lensed fiber (ALF). The optical force from the fiber with different tapered lengths and by incident light at different wavelengths is calculated. Numerically, the microsphere can be trapped by the fiber with tapered outline y=±x/0.5 and y=±x at a short incident wavelength of 900 nm. While for the fiber with tapered outline y=±x/2, the microsphere can be trapped by the light with longer wavelength of 1100 nm, 1300 nm, or 1500 nm. The optical trapping to a polystyrene microsphere is experimentally demonstrated in a microfluidic channel and the corresponding optical force is derived according to the fluid flow speed. This study can provide a guidance for future tapered fibre design for optical trapping to microspheres.

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