Investigation of the Flow Structure in a Model Scramjet Air Intake with Transverse Hydrogen Fuel Injection into Supersonic Crossflow

2021 ◽  
Vol 56 (3) ◽  
pp. 334-342
Author(s):  
R. K. Seleznev
Keyword(s):  
Flow Structure ◽  
Fuel Injection ◽  
Hydrogen Fuel ◽  
Air Intake

scholarly journals Experimental research in mechanic's field of control for further innovation in the hydraulic and electronic operated injection system

2019 ◽  
Vol 85 ◽  
pp. 08006 ◽  
Author(s):  
Iosif Ferenţi ◽  
Dan Opruţa ◽  
Doru Băldean
Keyword(s):  
Fuel Injection ◽  
Control Unit ◽  
Injection System ◽  
Minimal Amount ◽  
Operational Parameters ◽  
Complete Combustion ◽  
Sport Competition ◽  
Fuel Jet ◽  
Air Intake ◽  
Intake Pressure

In the present research paper is detailed an experimental work concerning Engine Control Unit (ECU) in order to trace predictive trend-lines regarding operational parameters such as ignition timing, fuel supply, injection duty, at more than ten engine speed regimes in the case of a powertrain for motor-sport competition, with distinct air pressures, injector status and spark advances. An experimental study of real values and trend-lines as well as actuator's output data was realized in order to point out electronic control unit's functional characteristics and to redefine the economic field with optimal combustion pressure, efficient mixture formation/burning and diminished emissions as a consequence of the proper measures. Air intake pressure influences the fundamental conditions for intake charge definition and for lambda level even prior to engine cycle beginning in the powertrain with port fuel injection (PFI). Lambda value expresses the operational quality in relation with the excess air intake compared to the minimal amount necessary for a complete combustion of fuel jet charge.

Validation of in-cylinder flow structure of controlled auto-ignition engine

2013 ◽  
Vol 10 (4) ◽  
pp. 305-312
Author(s):  
J. Beauquel ◽  
S. Ibrahim ◽  
R. Chen
Keyword(s):  
Experimental Data ◽  
Flow Structure ◽  
Transient Flow ◽  
Laser Doppler Anemometry ◽  
Auto Ignition ◽  
Geometry Configuration ◽  
Turbulent Flow Structure ◽  
Air Intake ◽  
Exhaust Valves ◽  
Actual Geometry

Numerical calculations have been carried out to investigate the in-cylinder transient flow structure of a controlled auto-ignition (CAI) engine running at speeds of 1,500rpm and 2,000rpm. The calculated turbulent flow structure and velocities are validated against published laser doppler anemometry (LDA) experimental data. The experimental data were re-processed to represent the time dependent mean velocities for all measured points. The actual geometry configuration of the engine is imported into the computational fluid dynamics (CFD) code used in this study. The simulations take into account the movement of the inlet, exhaust valves and the piston. The CFD simulations replicate the experimental work where only air was inserted into a driven optical engine. Also, to simulate an engine in controlled auto-ignition (CAI) mode, the same valve timing that allows 36% internal exhaust gas recirculation (IEGR) was applied for the air intake. The calculated results are found to agree well with the LDA measurements with an overall agreement of 75.06% at 1,500 rpm and 73.42% at 2,000 rpm.

Experimental Investigation of Hydrogen Fuel Injection in DI Dual Fuel Diesel Engine

2007 ◽  
Author(s):  
N. Saravanan ◽  
G. Nagarajan ◽  
C. Dhanasekaran ◽  
K. M. Kalaiselvan
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Fuel Injection ◽  
Dual Fuel ◽  
Hydrogen Fuel

scholarly journals Direct Measurements of Skin Friction in Supersonic Combustion Flow Fields

1992 ◽  
Author(s):  
K. M. Chadwick ◽  
D. J. Deturris ◽  
J. A. Schetz
Keyword(s):  
Skin Friction ◽  
Fuel Injection ◽  
Force Measurement ◽  
Tangential Force ◽  
Transverse Component ◽  
Supersonic Combustion ◽  
Quartz Tube ◽  
Hydrogen Fuel ◽  
Sensor Head ◽  
Scramjet Combustor

An experimental investigation was conducted to measure skin friction along the chamber walls of supersonic combustors. A direct force measurement device was used to simultaneously measure an axial and transverse component of the small tangential shear force passing over a non-intrusive floating element. This measurement was made possible with a sensitive piezoresistive deflection sensing unit. The floating head is mounted to a stiff cantilever beam arrangement with deflection due to the flow on the order of 0.00254 mm (0.0001 in). This allowed the instrument to be a non-nulling type. A second gauge was designed with active cooling of the floating sensor head to eliminate non-uniform temperature effects between the sensor head and the surrounding wall. The key to this device is the use of a quartz tube cantilever with piezoresistive strain gages bonded directly to its surface. A symmetric fluid flow was developed inside the quartz tube to provide cooling to the backside of the floating head. Tests showed that this flow did not influence the tangential force measurement. Measurements were made in three separate combustor test facilities. Tests at NASA Langley Research Center consisted of a Mach 3.0 vitiated air flow with hydrogen fuel injection at Pt = 500 psia (3446 kPa) and Tt = 3000 R (1667 K). Two separate sets of tests were conducted at the General Applied Science Laboratory (GASL) in a scramjet combustor model with hydrogen fuel injection in vitiated air at Mach = 3.3, Pt = 800 psia (5510 kPa), and Tt = 4000 R (2222 K). Skin friction coefficients between 0.001–0.005 were measured dependent on the facility and measurement location. Analysis of the measurement uncertainties indicate an accuracy to within ±10–15% of the streamwise component.

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