Droplet Sizes and Velocities in a Transient Diesel Fuel Spray

Koo, Jaye; Martin, Jay K.

doi:10.4271/900397

Cited by 46 publications

(24 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Experimentally it is difficult to obtain the surrounding gas velocity. Some researchers have used the velocity of the smallest droplets to approximate the gas velocity [33,39], but droplets measurements near the nozzle often show droplet velocities are independent of size. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Ahmed

Kawahara

Tomita

et al. 2010

JTST

View full text Add to dashboard Cite

The spray from a multi-hole injector applied to direct injection spark ignition (DISI) engine was investigated. In order to understand the detailed structure of the transient spray near the nozzle a combined LDA/PDA system was used. PDA system was optimized in order to detect relative smaller droplets. Size-classified technique was used to get deep information about the spray characterizations near nozzle. The experiments were performed at 7 MPa of injection pressure. At early stage of spray the droplet velocity distribution in the centre of the spray showed high value. Smaller droplets under 15 µm showing followability to air flow, while larger droplets over 20 µm will have drag due to momentum decay. Droplets of 15

show abstract

Section: Resultsmentioning

confidence: 99%

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Ahmed

Kawahara

Tomita

et al. 2010

JTST

View full text Add to dashboard Cite

show abstract

“…These needs included improved spatial and temporal resolution, as well as the ability to apply more realistic measurement conditions, such as injection into a high pressure gas. The work discussed in this section includes construction and comparisons for commercially available rate of injection meters , applications of commercial measurement devices under adverse conditions (Koo and Martin, 1990b), and development of multidimensional measurement methods .…”

Section: Experimental Developmentmentioning

confidence: 99%

“…Details of this work and the results are given by . A detailed look at transient fuel sprays was performed using an Aerometrics Phase Doppler Particle Analyzer (PDPA) by Koo and Martin (1990b). This work reflected the desire for an increased level of spatial and temporal detail in diesel type sprays.…”

Section: Experimental Developmentmentioning

confidence: 99%

“…For internal flow characteristics, initial computational results indicated that scaled internal flow experiments would prove enlightening and this was the experimental approach taken by Farrell (1992, 1993). For external injector flows a staged experimental/analytical approach was begun with initial experiments aimed at characterization of the integral injector spray breakup process followed by more sophisticated characterization using the Phase Doppler Particle Analyzer (PDPA) technique Martin, 1990b and for local point measurements and direct spray imaging of the jet for radial averaged results and associated analyses . The results of these investigations are summarized below.…”

Section: Engine Experimentsmentioning

confidence: 99%

“…The primary diagnostic used for this purpose was an Aerometrics PDPA using a Lucas CAV injector to demonstrate the feasibility of the concept (Koo and Martin 1990a, 1990b. This injector had a single hole of 0.24 mm diameter with a jet spray discharging into a stagnant isothermal chamber at a variety of gas densities (1-25 kg/m3).…”

Section: Engine Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Center for Advanced Propulsion Systems

Borman¹,

Corradini²,

Farrell³

et al. 1993

View full text Add to dashboard Cite

Public reporting burden for this c011ection of informatio IS estimated to averaage I hour Per response. including the time lot reiew0g mstructions, searching existing data source%.gathern and maintainr th, data needed, and completing and reviewing the collection of information Send comments regarding this burden estimate or any other aspect of this collection Of information, including suggestions for reducing this burden. SUPPLEMENTARY NOTESThe view, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other documentation. 12a. DISTRIBUTION / AVAILABIUTY STATEMENT 12b. DISTRIBUTION CODEApproved for public release; distribution unlimited. ABSTRACT (Maximum 200 words)This final report covers a six year period of research conducted by the Engine Research Center. The objectives of the ERC are: 1) to train students in special areas of diesel research of interest to the Army and its industrial suppliers, 2) provide a source of consultation for the Army, 3) provide knowledge and research tools for solution of long range problems of interest to the Army, 4) provide solution methods for problems of immediate interest to the Army, 5) to identify and explore new technologies which have potential value to the Army. A brief account is given of how these objectives were addressed. Subjects covered are; faculty, facilities, publications, and research results. The research topic areas discussed are: engine modeling; canbustion, emissions and fuels; heat transfer; fluid mechanics; diesel sprays; lubrication, mechanical design and materials.14. SUBJECT Comparison between measured and predicted cylinder 36 pressure (left) and wall heat flux (right) for premixedcharge SI engine combustion using heat transfer model with (modified case) and without (original) the effect of compressibility and unsteadiness. Engine speed 1500 rev/min. 7.1.2Comparison between computed (dashed line) and 36 measured (solid line) cylinder pressures (left) and wall heat flux (right) for compression ignited, homogeneous charge engine combustion (engine speed 1200 rev/min, compression ratio 10.5, swirl ratio 1.8, equivalence ratio 0.4). 7.1.3Predicted pressure histories obtained by incorporating the 39 multistep Shell ignition model (Case 2) and the standard one-step Arrhenius kinetics model (Case 1). 7.1.4Intake flow computation using the unstructured grid 40 version of KIVA-3 for stationary valves. 7.1.5Calculated cylinder pressures with and without ignition at 44 100 rpm and initial air temperatures of 241 K and 298 K. Optical window relative position to the combustion 61 chamber(part 2 of 2). 7.2.9The instrumentation system. 62 7.2.10 Flame temperature and soot concentration factor KL at 63 three angular positions for window A (24, 25, 26-3). 7.2.11Flame temperature and soot concentration factor KL at 64 three angular positions for window B (24, 25, 26-3). 7.2.12Flame temperature and soot concentration facto...

show abstract

Coherent Scattering by Multiple Particles in Phase Doppler Interferometry

Sankar

Ibrahim

Bachalo

1994

Part & Part Syst Charact

View full text Add to dashboard Cite

A theoretical model has been developed for studying the response of the phase Doppler interferometer when multiple particles are simultaneously present within the measurement probe volume. The developed model incorporates the geometrical optics theory for describing the coherent interaction between the scattered light signals of multiple particles, each having different size, velocity, trajectory, and arrival time. The resulting Doppler signal is processed by a theoretical signal processor which can simulate the performance characteristics of different signal processing schemes that are widely used in phase Doppler interferometry, namely, zero-crossing counter, covariance, autocorrelation, and DFT processors. The application of the developed model for studying the coherent scattering by two particles has been specifically addressed in this paper. It has been shown that a DFT processor can be used to simultaneously measure the size and velocity of the two particles in most instances. However, for more than two particles, the signal processing scheme becomes more complex because of a quadratic increase in the beat frequency components.

show abstract

Droplet Sizes and Velocities in a Transient Diesel Fuel Spray

Cited by 46 publications

References 17 publications

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Characterization of the Spray of the DISI Multi-hole Injector by Means of Phase Doppler Anemometer

Center for Advanced Propulsion Systems

Coherent Scattering by Multiple Particles in Phase Doppler Interferometry

Contact Info

Product

Resources

About