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Abstract Analytical and numerical investigation of methane–air lean combustibility limit (LCL) in reciprocal flow filtration combustion reactor was performed. Practically important parameters (heat loss coefficient, reactor length, pressure, particles size, porosity) were varied and corresponding sets of LCL curves were built. Existence of extremum at LCL – gas flow rate function is found. Numerical study shows that the porous media particle size is the most important factor for LCL control. Smaller particles provide lower LCL and reduce steepness of the growing branch of the LCL-gas flow rate function. For the particles smaller than 2 mm the corresponding LCL line goes down monotonously. High pressure in the system provides better LCL, which may be used for stabilization of the reactors operating at near LCL regimes.

Abstract Analytical and numerical investigation of methane–air lean combustibility limit (LCL) in reciprocal flow filtration combustion reactor was performed. Practically important parameters (heat loss coefficient, reactor length, pressure, particles size, porosity) were varied and corresponding sets of LCL curves were built. Existence of extremum at LCL – gas flow rate function is found. Numerical study shows that the porous media particle size is the most important factor for LCL control. Smaller particles provide lower LCL and reduce steepness of the growing branch of the LCL-gas flow rate function. For the particles smaller than 2 mm the corresponding LCL line goes down monotonously. High pressure in the system provides better LCL, which may be used for stabilization of the reactors operating at near LCL regimes.

Abstract The dynamics of isolated-photon plus two-jet production in pp collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset corresponding to an integrated luminosity of 36.1 fb−1. Cross sections are measured as functions of a variety of observables, including angular correlations and invariant masses of the objects in the final state, γ + jet + jet. Measurements are also performed in phase-space regions enriched in each of the two underlying physical mechanisms, namely direct and fragmentation processes. The measurements cover the range of photon (jet) transverse momenta from 150 GeV (100 GeV) to 2 TeV. The tree-level plus parton-shower predictions from Sherpa and Pythia as well as the next-to-leading-order QCD predictions from Sherpa are compared with the measurements. The next-to-leading-order QCD predictions describe the data adequately in shape and normalisation except for regions of phase space such as those with high values of the invariant mass or rapidity separation of the two jets, where the predictions overestimate the data.