Time-resolved spectroscopy is employed to analyze micro plasma generated in laboratory air. Stark-broadened emission profiles for hydrogen alpha and beta allow us to determine plasma characteristics for specific time delays after plasma generation. Stark shift, asymmetry, and full width half maximum measurements are used to infer electron density. The measurements of hydrogen alpha and beta Bal...

The dynamics of one-dimensional, overdriven, hydrogen-air detonations predicted in the inviscid limit as well as with the inclusion of mass, momentum, and energy diffusion were investigated. A series of shock-fitted calculations was performed in which the overdrive was varied in the inviscid limit. The 0.97 MHz frequency of oscillation predicted for a f = 1.1 overdriven detonation agrees well w...

Structural phase transitions have been observed using IR-VIS sum frequency generation (SFG) at the air/acetonitrile-water and the air/propionitrile-water interfaces but not at the air/butyronitrile-water interface. The phase transitions were detected by abrupt changes in the CN vibrational frequency and in the orientation of the CN chromophore as the interface nitrile density was varied. A mode...

Autoigntion and front propagation behavior in Low Temperature Combustion (LTC) engine environments is investigated in this paper. First, non-reacting 3D engine simulations are conducted to investigate different mixture formation scenarios that might exist in LTC engines prior to autoignition. It is found that depending on the timing of fuel spray injection and the level of wall heat loss, two d...

In the current work, effect of H2O2 addition on flame structure, laminar speed and NOx emissions is investigated in context 1D premixed H2/air flames at Tu = 300 600 K, p 1 30 atm, ? 0.5. Mathematical tools from computational singular perturbation approach are used order to identify key chemical transport mechanisms. The causes a significant increase (sL), heat release (Q) emissions. Indicative...

Load changing performance is significant for the application of proton exchange membrane fuel cells (PEMFCs). This paper compares experimental results hydrogen-air and hydrogen-oxygen PEMFC analyzes their dynamic under various operating conditions. We use electrochemical impedance spectroscopy to investigate intrinsic mechanism during load changing. Due higher oxygen concentration, responds fas...

The evolution from natural gas usage to new technologies, such as the use of hydrogen fuel or electricity‐based heating, strongly influences oxidation stainless steel surface in reheating furnace. Thermogravimetric tests using different simulated combustion and induction conditions were performed for austenitic AISI 301 304, ferritic 444 grades. Simulated furnace atmospheres methods based on me...

To investigate the effect of high-pressure hydrogen gas on fracture high-strength low-alloy steels, rising load tests were conducted JIS SNCM439 steel in (20 MPa) at room temperature (20–25°C), and its hydrogen-induced crack initiation behavior was investigated. The load-crack opening displacement curve obtained for began to deviate from that air very low loads, indicating stress intensity fact...

Hydrogen may play a major role as an energy source to support net zero but combustion leads emissions of NO x , key air pollutant. Delivering optimal quality co-benefits need more ambitious hydrogen-specific emission standards developing.