Joseph Lefkowitz

Joseph Lefkowitz

Assistant Professor

Aeronautics 127

B.Sc. in Mechanical Engineering, Johns Hopkins University (2009). Ph.D. in Mechanical and Aerospace Engineering, Princeton University (2016). Postdoctoral Fellowship in the US Air Force Research Laboratory (2016-2017).

Ignition and flame dynamics in subsonic and supersonic flows, plasma-assisted combustion (PAC), hydrocarbon fuel and plasma chemical kinetics, alternative fuel characterization.

Measurement Technique Development:
Infrared thermography and spectroscopy, tunable diode laser absorption spectroscopy (TDLAS), laser induced fluorescence (LIF), optical emission spectroscopy (OES).

Positions available

R.D. Stachler, J.K. Lefkowitz, J.S. Heyne, S.D. Stouffer, T.M. Ombrello, J.D. Miller, “An Investigation into the Effect of Residence Time and Equivalence Ratio on Ignition in a Toroidal Jet Stirred Reactor,” Proc. Combust. Inst. (Submitted).

L. Wermer, J.K. Lefkowitz, T. Ombrello, S. Im, “Ignition Enhancement by Dual-pulse Laser-induced Spark Ignition in a Lean Premixed Methane-air Flow,” Proc. Combust. Inst. (Submitted).

J.M. Bonebrake, D.L. Blunck, J.K. Lefkowitz, T.M. Ombrello, “The Effect of Nanosecond Pulsed High Frequency Discharges on the Temperature Evolution of Ignition Kernels,” Proc. Combust. Inst. (Submitted).

J.K. Lefkowitz, T. Ombrello, “Reduction of Flame Development Time in Nanosecond Pulsed High Frequency Discharge Ignition of Flowing Mixtures,” Combust. Flame (Submitted).

L. Wermer, J.K. Lefkowitz, T. Ombrello, M.S. Bak, S. Im, “Spatiotemporal Evolution of the Plasma from Dual-pulsed Laser-induced Breakdown in an Atmospheric Air”, Plasma Sources Sci. Technol. (Accepted).

J.K. Lefkowitz, T. Ombrello, “An Exploration of Inter-pulse Coupling in Nanosecond Pulsed High Frequency Discharge Ignition,” Combust. Flame 180 (2017) 136-147.

A. Rousso, S. Yang, J.K. Lefkowitz, W. Sun, Y. Ju, “Low Temperature Oxidation and Pyrolysis of n-Heptane in Nanosecond-pulsed Plasma Discharges,” Proc. Combust. Inst 36 (2017) 4105-4112.

S. Yang, J.K. Lefkowitz, S. Nagaraja, X. Gao, V. Yang, Y. Ju, W. Sun, “Numerical and Experimental Investigation of Nanosecond Pulsed Plasma Activated C2H4/O2/Ar Mixtures in a Flow Reactor,” J. Propul. Power 32 (2016) 1240-1252.

Y. Ju, J.K. Lefkowitz, C.B. Reuter, S.H. Won, X. Yang, S. Yang, W. Sun, Z. Jiang, Q. Chen, “Plasma Assisted Low Temperature Combustion,” Plasma Chemistry and Plasma Processing 36 (2016) 85-105.

J.K. Lefkowitz, P. Guo, A. Rousso, Y. Ju, “Species and Temperature Measurements of Methane Oxidation in a Nanosecond Repetitively Pulsed Discharge,” Phil. Trans. R. Soc. A 373 (2015)  20140333.

J.K. Lefkowitz, P. Gou, T. Ombrello, S.H. Won, C. Stevens, J. Hoke, F. Schauer, Y. Ju, “Schlieren Imaging and Pulsed Detonation Engine Testing of Ignition by a Nanosecond Repetitively Pulsed Discharge,” Combust. Flame 162 (2015) 2496-2507.

J.K. Lefkowitz, M. Uddi, B.C. Windom, G. Lou, Y. Ju, “In situ Species Diagnostics and Kinetic Study of Plasma Activated Ethylene Dissociation and Oxidation in a Low Temperature Flow Reactor,” Proc. Combust. Inst. 35 (2015) 3505-3512.

J.K. Lefkowitz, S.H. Won, Y. Fenard, Y. Ju, “Uncertainty Assessment of Species Measurements in Acetone Counterflow Diffusion Flames,” Proc. Combust. Inst. 34 (2013) 813-820.

J.K. Lefkowitz, J.S. Heyne, S.H. Won, S. Dooley, H.H. Kim, F.M. Haas, S. Jahangirian, F.L. Dryer, Y. Ju, “A Chemical Kinetic Study of tertiary-Butanol in a Flow Reactor and a Counterflow Diffusion Flame,” Combust. Flame 159 (2012) 968-978.