A Methodology for Afterburner Evaluation

A preliminary investigation of the performance of an afterburner module proposed by the Gas Turbine Research Establishment, Bangalore for the Kaveri engine has been carried out. The investigation, which was both theoretical and experimental, evaluated the af-terburner configuration on the basis of flame stability, combustion efficiency and total pressure loss. An evaluation methodology, which was formulated, has been employed to arrive at design modifications for improved performance

An Experimental Study of the Performance of a Subscale Kerosene - Fuelled Ejector Ramjet at Simulated Takeoff

The ejector ramjet is a rocket based combined cycle propulsion system in which a rocket and ramjet are integrated to accrue synergistic benefits. A proof-of-concept experiment to augment the thrust of a simulated rocket by the induction of air through an ejector and the subsequent afterburning of kerosene fuel in it is described. Ejector ram-jet thrust augmentation ratios of up to around 1.1 at the simulated take off conditions have been achieved. The critical effect of the operating conditions and the ejector ramjet geometry, in particular the afterburner configuration, for achieving thrust augmentation ratios greater than one have been demonstrated

Air Mass Flow Calibration of the 1 : 6 scale LCA intake model

This report provides details of the air mass flow calibration work carried out in respect of the 1 :6 scale LCA intake model . An ejector with a constant area mixing tube was used to draw air through the intake model . A maximum of 0 .72 kg/s of air flow could be drawn through the model, when both side inlets were open . Further increases in the quantity of air drawn through the model could not be achieved due to high total pressure losses in the system . However, in the range of intake air flow rates achieved, a linear relationship with measured data was observed which could be extrapolated to higher flow rates with minimum errors

An Experimental Investigation of a Four Inlet, Side Dump Combustor of a Kerosene - Fuelled Boosted Ramjet

An experimental investigation of a four-inlet side dump combustor configuration suitable for a boosted ramjet has been carried out. Combustor characteristics were obtained from water tunnel simulation and direct-connect combustion tests. A perspex, one third scale, model of the ramjet combustor was tested in a water rig. Flow field visualisation was accomplished by employing the hydrogen bubble streak technique. The best placement of the cruciform flameholder relative to the air inlet plane was determined. A similar combustor was made from stainless steel and tested in a combustor test rig. Combustion efficiency, cold and hot total pressure loss and ignition characteristics and lean blow-out limits were obtained. A design methodology for ramjet combustors has been arrived at

Magnetocaloric effect in La1-xSrxCoO3 (0.05 <= x <= 0.40)

We report studies of magnetocaloric effect in lanthanum cobaltate doped with different Sr-concentrations, La1-xSrxCoO3 (0.05 less than or equal to x less than or equal to 0.4). The study has revealed that La0.6Sr0.4CoO3, which exhibits a moderately large value of maximum entropy change of about 1.45 J/kg/K in 1.5 T DC-fieid around its Curie temperature (of 235 K), can be used as an active magnetic refrigerant (AMR) material at similar to 2.35 K. (C) 1999 Elsevier Science B.V. Al rights reserved

Symptomatology of Musculoskeletal Pain Related to Repetitive Movements. Preliminary Study “Post-harvest in Floriculture Companies”

Musculoskeletal injuries affect the health of workers worldwide. This research relates the repetitive movements with the generation of musculoskeletal injuries in workers of the post-harvest area of a flower company. The evaluation methodology is the OCRA check list. The symptomatology of musculoskeletal pain was evaluated applying the Nordic questionnaire. The injuries were determined comparing morbidity rates and medical records of a sample of eighteen workers in Flores del Cotopaxi S.A. The results show that there is risk due to repetitive movements in activities like classification and bunching. Statistical tests established significant incidence (p = 0.015) for chi-square and (OR = 15), Odds Ratio. In both tests a confidence level of 95% was used. In the post-harvest area exist risks as a consequence of repetitive movements linked to the generation of musculoskeletal injury, mainly in the shoulders and wrists. © Springer Nature Switzerland AG 2020