scholarly journals Online Water Wash Tests of GE J85-13

2007 ◽  
Vol 129 (1) ◽  
pp. 136-142 ◽  
Author(s):  
Elisabet Syverud ◽  
Lars E. Bakken
Keyword(s):  
Air Force ◽  
Droplet Size ◽  
Pressure Sensors ◽  
Engine Performance ◽  
Jet Engine ◽  
Additional Information ◽  
Droplet Sizes ◽  
Temperature And Pressure ◽  
Visual Observations

This paper reports the results of a series of online water wash tests of a GE J85-13 jet engine at the test facilities of the Royal Norwegian Air Force. The engine performance was deteriorated by injecting atomized saltwater at the engine inlet. The engine was then online washed with water injected at three different droplet sizes (25, 75, and 200μm) and at water-to-air ratios ranging from 0.4% to 3% by mass. Engine performance was measured using standard on-engine instrumentation. Extra temperature and pressure sensors in the compressor section provided additional information of the propagation of deposits in the aft stages. The measurements were supported by visual observations. The overall engine performance improved rapidly with online wash. The buildup of deposits in the aft stages was influenced both by the droplet size and the water-to-air ratio. The water-to-air ratio was the most important parameter to achieve effective online washing.

scholarly journals Online Water Wash Tests of GE J85-13

2005 ◽  
Author(s):  
Elisabet Syverud ◽  
Lars E. Bakken
Keyword(s):  
Air Force ◽  
Droplet Size ◽  
Pressure Sensors ◽  
Engine Performance ◽  
Jet Engine ◽  
Additional Information ◽  
Droplet Sizes ◽  
Temperature And Pressure ◽  
Visual Observations

This paper reports the results of a series of online water wash tests of a GE J85-13 jet engine at the test facilities of the Royal Norwegian Air Force. The engine performance was deteriorated by injecting atomized saltwater at the engine inlet. Then the engine was online washed with water injected at three different droplet sizes (25, 75 and 200 μm) and at water-to-air ratios ranging from 0.4% to 3% by mass. Engine performance was measured using standard on-engine instrumentation. Extra temperature and pressure sensors in the compressor section provided additional information of the propagation of deposits in the aft stages. The measurements were supported by visual observations. The overall engine performance improved rapidly with online wash. The build-up of deposits in the aft stages was influenced both by the droplet size and the water-to-air ratio. The water-to-air ratio was the most important parameter to achieve effective online washing.

scholarly journals Droplet Size and Spray Dispersion Characteristics of an Impingement-Jet Type Jet Engine Fuel Injector

2008 ◽  
Vol 74 (746) ◽  
pp. 2213-2220
Author(s):  
Takahiro TAMURA ◽  
Mikiya ARAKI ◽  
Hideshi YAMADA ◽  
Seiichi SHIGA ◽  
Shigeru HAYASHI ◽  
...  
Keyword(s):  
Droplet Size ◽  
Engine Fuel ◽  
Dispersion Characteristics ◽  
Fuel Injector ◽  
Jet Engine ◽  
Impingement Jet

scholarly journals The laboratory test rig with miniature jet engine to research aviation fuels combustion process

2015 ◽  
Vol 36 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Bartosz Gawron ◽  
Tomasz Białecki
Keyword(s):  
Research And Development ◽  
Laboratory Test ◽  
Air Force ◽  
Combustion Process ◽  
Jet Engines ◽  
Test Rig ◽  
Jet Engine ◽  
Measurement Results ◽  
Institute Of Technology ◽  
Main Components

Abstract This article presents laboratory test rig with a miniature turbojet engine (MiniJETRig – Miniature Jet Engine Test Rig), that was built in the Air Force Institute of Technology. The test rig has been developed for research and development works aimed at modelling and investigating processes and phenomena occurring in full scale jet engines. In the article construction of a test rig is described, with a brief discussion on the functionality of each of its main components. Additionally examples of measurement results obtained during the realization of the initial tests have been included, presenting the capabilities of the test rig.

Effect of temperature and pressure on cavitation characteristics in RP-3 jet fuel

2021 ◽  
pp. 2150375
Author(s):  
Chao Qiu ◽  
Shuxian Chen ◽  
Feng Yan ◽  
Yaoming Fu ◽  
Wuguo Wei
Keyword(s):  
Cavitation Erosion ◽  
Engine Performance ◽  
Jet Fuel ◽  
Effect Of Temperature ◽  
Fuel System ◽  
Fuel Temperature ◽  
Fuel Droplets ◽  
Aircraft Fuel ◽  
Different Temperatures ◽  
Temperature And Pressure

Cavitation usually appears in aircraft fuel system, which is significant for the operation of engine. Uncontrollable cavitation will cause cavitation erosion to the units of fuel system, while the controllable cavitation can enhance the turbulence of fuel and improve the engine performance. This work along with molecular dynamics was used to simulate the cavitation in RP-3 jet fuel with different temperatures and pressures. The influence of fuel temperature and pressure on cavitation characteristics was studied. It is indicated that the higher the temperature is, the more easily the RP-3 jet fuel cavitate. Furthermore, the influence of pressure on cavitation can be divided into two periods. The lower the fuel pressure is, the faster the occurrence and development of cavitation in RP-3 jet fuel. When the temperature and pressure of the RP-3 jet fuel are set at the region between the line [Formula: see text] and [Formula: see text]%, the cavitation erosion can be almost ignored, and the dispersion of fuel droplets is almost the best.

Method of metrological self-checking of a strain gauge pressure sensor

Metrologiya ◽  
2020 ◽  
pp. 48-62
Author(s):  
Vladimir A. Larionov
Keyword(s):  
Strain Gauge ◽  
Supply Voltage ◽  
Experimental Studies ◽  
Pressure Sensors ◽  
Experimental Sample ◽  
Self Monitoring ◽  
Gauge Pressure ◽  
External Conditions ◽  
Temperature And Pressure ◽  
Overall Resistance

Existing methods of metrological self-monitoring of measuring sensors for temperature and pressure of technological industries are considered. The analysis of methods of metrological self-checking of strain gauge pressure sensors is carried out. Method is proposed based on measuring the supply voltage and voltage on the measuring diagonal of the bridge. The temperature of the strain gauge bridge is determined using a semiconductor thermistor installed near the bridge. This allows you to adjust the measured value of the total resistance of the bridge from the temperature of the bridge. With aging and exposure to external conditions, a change in the overall resistance of the bridge can be used to judge the error of the sensor. An experimental sample of the sensor was made. The failure of the strain gage bridge is simulated by parallel connection of an additional resistor to one of the shoulders of the bridge. Experimental studies have shown that modern technical means make it possible to assess the effect of changes in the total bridge resistance on the sensor error.

Droplet size impact on lactofen and acifluorfen efficacy for Palmer amaranth (Amaranthus palmeri) control

2019 ◽  
Vol 34 (3) ◽  
pp. 416-423
Author(s):  
Lucas X. Franca ◽  
Darrin M. Dodds ◽  
Thomas R. Butts ◽  
Greg R. Kruger ◽  
Daniel B. Reynolds ◽  
...  
Keyword(s):  
Droplet Size ◽  
Pulse Width Modulation ◽  
Effective Means ◽  
Cost Effective ◽  
Palmer Amaranth ◽  
Target Movement ◽  
Spray Droplet ◽  
Spray Droplets ◽  
Droplet Sizes ◽  
Biomass Reduction

AbstractHerbicide applications performed with pulse width modulation (PWM) sprayers to deliver specific spray droplet sizes could maintain product efficacy, minimize potential off-target movement, and increase flexibility in field operations. Given the continuous expansion of herbicide-resistant Palmer amaranth populations across the southern and midwestern United States, efficacious and cost-effective means of application are needed to maximize Palmer amaranth control. Experiments were conducted in two locations in Mississippi (2016, 2017, and 2018) and one location in Nebraska (2016 and 2017) for a total of 7 site-years. The objective of this study was to evaluate the influence of a range of spray droplet sizes [150 (Fine) to 900 μm (Ultra Coarse)] on lactofen and acifluorfen efficacy for Palmer amaranth control. The results of this research indicated that spray droplet size did not influence lactofen efficacy on Palmer amaranth. Palmer amaranth control and percent dry-biomass reduction remained consistent with lactofen applied within the aforementioned droplet size range. Therefore, larger spray droplets should be used as part of a drift mitigation approach. In contrast, acifluorfen application with 300-μm (Medium) spray droplets provided the greatest Palmer amaranth control. Although percent biomass reduction was numerically greater with 300-μm (Medium) droplets, results did not differ with respect to spray droplet size, possibly as a result of initial plant injury, causing weight loss, followed by regrowth. Overall, 900-μm (Ultra Coarse) droplets could be used effectively without compromising lactofen efficacy on Palmer amaranth, and 300-μm (Medium) droplets should be used to achieve maximum Palmer amaranth control with acifluorfen.

Sign in / Sign up

Export Citation Format

Share Document