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Using Plasmas for High-Speed Flow Control and Combustion Control

Keshav, Saurabh
http://rave.ohiolink.edu/etdc/view?acc_num=osu1222026159

Abstract Details

2008, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Experiments on characterization of Localized Arc Filament Plasma Actuators used for high-speed flow control, as well as experimental studies of chemiluminescence and chemi-ionization for flame emission and combustion control have been discussed. Pulsed DC and pulsed RF actuator discharge power measurements and plasma temperature measurements demonstrated that rapid localized heating, at a rate of 1000 degrees C / 10 μs, can be achieved at low time-averaged actuator powers, 10-20 W for 10% duty cycle. Kinetic modeling of a pulsed arc filament demonstrated formation of strong compression waves due to rapid localized heating, which have also been detected in the experiments. The effect of electrons in chemi-ionized supersonic flows of combustion products on flow emission is studied experimentally. For this, a stable ethylene/oxygen/argon flame is sustained in a combustion chamber at a stagnation pressure of P0=1 atm. Electron density in M=3 flow of combustion products has been measured using Thomson discharge. The results show that nearly all electrons can be removed from the flow by applying a moderate transverse electric field. No effect of electron removal on CH and C2 emission from the flow has been detected. Also, electron removal did not affect NO β band and CN violet band emission when nitric oxide was injected into the combustion product flow. Chemi-ionization current measured in the supersonic flows of combustion products has been used for feedback combustion control. The experiments showed that time-resolved chemi-ionization current is in good correlation with the visible emission (CH and C2 bands) in the combustor at unstable combustion conditions, and is nearly proportional to the equivalence ratio at stable combustion conditions. Chemi-ionization current signal from the combustion product flow has been used to control an actuator valve in the fuel delivery line and to maintain the equivalence ratio in the combustor at the desired level.
Igor Adamovich, PhD (Advisor)
Mohammad Samimy, PhD (Committee Member)
Walter Lempert, PhD (Committee Member)
William Rich, PhD (Committee Member)
Vishwanath Subramaniam, PhD (Committee Member)
268 p.
Aerospace Materials; Engineering; Mechanical Engineering
high-speed flow; repetitively pulsed plasmas; chemiluminescence; chemi-ionization; combustion control; rocket plume

Recommended Citations

Citations

  • Keshav, S. (2008). Using Plasmas for High-Speed Flow Control and Combustion Control [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222026159

    APA Style (7th edition)

  • Keshav, Saurabh. Using Plasmas for High-Speed Flow Control and Combustion Control. 2008. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1222026159.

    MLA Style (8th edition)

  • Keshav, Saurabh. "Using Plasmas for High-Speed Flow Control and Combustion Control." Doctoral dissertation, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222026159

    Chicago Manual of Style (17th edition)

osu1222026159
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© 2008, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.