Effects of air-injection pressure on airflow pattern of air sparging

2020 ◽  
pp. 1-11
Author(s):  
Arvin Farid ◽  
Atena Najafi ◽  
Jim Browning ◽  
Elisa Barney Smith
Keyword(s):  
Injection Pressure ◽  
Air Injection ◽  
Air Sparging ◽  
Airflow Pattern

Effects of surfactant injection position on the airflow pattern and contaminant removal efficiency of surfactant-enhanced air sparging

2021 ◽  
Vol 402 ◽  
pp. 123564
Author(s):  
Long Xu ◽  
Yongsheng Wang ◽  
Fusheng Zha ◽  
Qiong Wang ◽  
Bo Kang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Air Sparging ◽  
Contaminant Removal ◽  
Airflow Pattern

Study of the Effect of Air Injection On the Surge and Flow Characteristic of Compressor and the Pumping Loss in a Heavy-Duty Turbocharged NGSI Engine

2021 ◽  
Author(s):  
Cheng Liao ◽  
Jianqin Fu ◽  
Dan Zhao ◽  
Chengqin Ren ◽  
Jingping Liu ◽  
...  
Keyword(s):  
Flow Characteristic ◽  
Prediction Models ◽  
Injection Pressure ◽  
Air Injection ◽  
Heavy Duty ◽  
Bench Tests ◽  
Injection Process ◽  
Flow Capacity ◽  
Compressor Surge ◽  
Loss Efficiency

Abstract In this study, bench tests of a heavy-duty turbocharged natural gas spark ignition (NGSI) engine were conducted with intake air injection at full load and different engine speeds. The flow characteristic of the compressor was revealed. The flow capacity of the compressor is reduced with air injection, and the reduction range increases gradually with the air injection pressure increasing at a constant speed, which would likely lead the compressor to surge. But the decrease extent of the compressor flow rate is improved as the speed increases, which reduces the tendency of surge. Based on those, prediction models for safe air injection pressure which can avoid compressor surge during various operations were proposed and then validated with experimental data. In addition, the influence of air injection on the pumping loss was also analyzed. The turbocharger efficiency is reduced therefore the pumping loss of the engine is increased during the air injection process. At 1200 rpm, the pumping loss efficiency of the engine without air injection is 0.25%, while it is increased to 1.83% with an air injection pressure of 400kPa at the same load.

scholarly journals Study of a hybrid pneumatic-combustion engine under steady-state and transient conditions for transport application

2019 ◽  
pp. 146808741986032
Author(s):  
Yidong Fang ◽  
Yiji Lu ◽  
Xiaoli Yu ◽  
Lin Su ◽  
Zhipeng Fan ◽  
...  
Keyword(s):  
Steady State ◽  
Combustion Engine ◽  
Engine Performance ◽  
Injection Pressure ◽  
Mathematic Model ◽  
Air Injection ◽  
Compressed Air ◽  
Transient Performance ◽  
Engine Torque ◽  
Tank Pressure

In this study, a new form of hybrid pneumatic combustion engine based on compressed air injection boosting is proposed. The hybrid pneumatic combustion engine regenerates the wasted energy during engine brake to improve the engine performance achieving better fuel economy. The mathematic model of the hybrid pneumatic combustion engine including a supercharged engine and the compressed air tank has been established. The steady-state and transient performance of the engine are analysed. Results show that the air injection boosting system can effectively improve the steady-state performance. Under the speed of 1900 r/min and 100% load, the engine torque and power can be increased from 1039 N m, 206.9 kW to 1057 N m, 210 kW by adopting air injection boosting with the injection pressure of 0.5 MPa. Effects of air injection parameters are also studied, showing that better performance can be achieved under higher air tank pressure and larger injection hole diameter. In addition, a transient analysis is completed under the speed of 1100 r/min. The result shows that when air injection boosting is used, the responding time of the engine to an instant load increase can be potentially reduced from 5.5 to 3.5 s under the injection pressure and duration of 0.5 MPa and 3 s. Meanwhile, the tank pressure has limited influence on the transient performance of the engine.

scholarly journals Study of Displacement Characteristics of Fire Flooding in Different Viscosity Heavy Oil Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Bingyan Liu ◽  
Jinzhong Liang ◽  
Fang Zhao ◽  
Tong Liu ◽  
Zongyao Qi ◽  
...  
Keyword(s):  
Heavy Oil ◽  
Early Stage ◽  
Injection Pressure ◽  
High Viscosity ◽  
Production Performance ◽  
Air Injection ◽  
Oil Reservoirs ◽  
Stable Combustion ◽  
Heavy Oil Reservoirs ◽  
Water Cut

A field test in the Xinjiang oilfield in China shows that the viscosity of heavy oil has a certain influence on the combustion dynamics and injection-production performance of fire flooding. The experiment in this study uses a one-dimensional combustion tube to study the temperature, gas composition, and air injection pressure and the production performance of the fire flooding of heavy oil with different viscosities. The results show that the oil viscosities of 1180–22500 mPa·s can achieve stable combustion, and the O2 content of the gas produced during the stable combustion stage is <0.5%. The higher the viscosity of the heavy oil, the higher the temperature in the burned zone and the smaller the range of the temperature increase in the unburned zone. The air injection pressure will increase rapidly until a stable seepage channel is formed, and then, it will drop to a level close to the formation pressure. High-viscosity heavy oil requires a higher air injection pressure and will remain in the high-pressure stage for a longer period of time. Low-viscosity heavy oil has a low water cut in the early stage of fire flooding, a large oil production rate, and a low and stable air–oil ratio. The water cut of high-viscosity heavy oil increases rapidly in the early stage of fire flooding and then decreases gradually, so a good air–oil ratio can only be obtained in the middle and late stages of fire flooding. Thus, fire flooding may be more suitable for application in common heavy oil and some extra heavy oil reservoirs with lower viscosities.

HEAT TRANSPER IN COMPRESSIBLE TURBULENT BOUNDARY LAYER WITH AIR INJECTION

1970 ◽  
Author(s):  
B. P. Mironov ◽  
M.I. Smirnov ◽  
Nadezhda I. Yarygina
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Air Injection

The Effect of Using Ramps with Trench Cylindrical Holes on Film Cooling Effectiveness

2015 ◽  
Vol 3 (2) ◽  
pp. 15-27
Author(s):  
Ahmed A. Imram ◽  
Humam K. Jalghef ◽  
Falah F. Hatem
Keyword(s):  
Numerical Simulation ◽  
Film Cooling ◽  
Air Injection ◽  
Baseline Model ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness ◽  
Blowing Ratio ◽  
Hot Air ◽  
Test Study ◽  
Cylindrical Holes

     The effect of introducing ramp with a cylindrical slot hole on the film cooling effectiveness has been investigated experimentally and numerically. The film cooling effectiveness measurements are obtained experimentally. A test study was performed at a single mainstream with Reynolds number 76600 at three different coolant to mainstream blowing ratios 1.5, 2, and 3. Numerical simulation is introduced to primarily estimate the best ramp configurations and to predict the behavior of the transport phenomena in the region linked closely to the interaction between the coolant air injection and the hot air mainstram flow. The results showed that using ramps with trench cylindrical holes would enhanced the overall film cooling effectiveness by 83.33% compared with baseline model at blowing ratio of 1.5, also  the best overall flim cooling effectevness was obtained at blowing ratio of 2 while it is reduced at blowing ratio of 3.

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