Design and Development of an Airblast Atomiser for the KAVERI engine and the sectoral combustor tests

This report deals with the design and development of an airblast atomiser for application in the KAVERI engine. Five atomisers of the chosen design were fabricated and tested at ambient conditions to determine the fuel spray SMD, patternation, cone angle and atomiser flow number. The atomiser performance parameters specified were achieved and hot tests carried out in the 90° combustor sector. The combustor pressure loss, exit temperature distribution, ignition and stability limits were evaluate

An isobar contour plot progrz

A computer program was developed to obtain ; isobar contours from the total pressure measurements at the engine face of an 1/3 scale model of an aircraft intake duct provided by ADA . A cubic spline method was used to interpolate the total pressure value between the measuring stations . The isobar contour plots were obtained for engine face Mach numbers\ud varying from 0.17 to 0 .43

Calibration of Pitot static probes for HAL, Koraput

This document explains the calibration procedure adopted to test the pitot-static probes, as required by HAL, Koraput . These probes (16 n.o)s were calibrated in the 254 min x 102 mm induction tunnel of the Aerodynamics Division of the Laboratory . The probe calibration factor were determined and tabulated as show

The effects of impaired cerebral circulation on Alzheimer's disease pathology: evidence from animal studies.

Persistent systemic hypoxia, a direct consequence of alterations in vascular function, can compromise the brain by increasing the risk of developing dementias such as Alzheimer’s disease (AD). Vascular contributions to cognitive impairment and AD in aged individuals are common, and several vascular risk factors for AD are linked to hypoxia. Clinical evidence confirms that structural and functional changes characteristic of AD pathology also occur following hypoxic-ischemic events such as stroke and traumatic brain injury. Studies with transgenic and non-transgenic mouse models reliably show that hypoxia increases the levels of amyloid- peptides that form the characteristic plaques in AD brains. Moreover, some studies suggest that vascular lesions also promote tau phosphorylation, modulate apolipoprotein E expression, and have more profound in effects in aged animals, but additional evidence is needed to establish these findings. Although the mechanisms underlying hypoxia-related effects remain unclear, controlled animal studies continue to reveal mechanistic aspects of the relationship between hypoxia and AD pathology that are necessary for therapeutic developments. The present review summarizes evidence from rodent studies regarding the effects of hypoxia on AD-related pathology and evaluates its impact on understanding human disease.Persistent systemic hypoxia, a direct consequence of alterations in vascular function, can compromise the brain by increasing the risk of developing dementias such as Alzheimer’s disease (AD). Vascular contributions to cognitive impairment and AD in aged individuals are common, and several vascular risk factors for AD are linked to hypoxia. Clinical evidence confirms that structural and functional changes characteristic of AD pathology also occur following hypoxic-ischemic events such as stroke and traumatic brain injury. Studies with transgenic and non-transgenic mouse models reliably show that hypoxia increases the levels of amyloid- peptides that form the characteristic plaques in AD brains. Moreover, some studies suggest that vascular lesions also promote tau phosphorylation, modulate apolipoprotein E expression, and have more profound in effects in aged animals, but additional evidence is needed to establish these findings. Although the mechanisms underlying hypoxia-related effects remain unclear, controlled animal studies continue to reveal mechanistic aspects of the relationship between hypoxia and AD pathology that are necessary for therapeutic developments. The present review summarizes evidence from rodent studies regarding the effects of hypoxia on AD-related pathology and evaluates its impact on understanding human disease

Calibration of fuel flow metering RIG for HAL Bangalore

This document describes the calibration tests carried out on the fuel flow metering rig used in fuelling and de-fuelling of the Jaguar aircraft in the final assembly section at H.A.L , Bangalore. The results of the calibration tests are tabulated and are also shown graphicall

Calibration of pitot-static probes for 4 BRD Kanpur

This document explains the calibration procedure adopted to test the pitot-static probes, as required by 4 BRD, Kanpur. These probes (4 nos) were calibrated in the 254 mm x 102 mm induction tunnel of the Aerodynamics Division of the Laboratory. The probe calibration factors were determined and tabulated as shown

Multifunction nozzles

The next generation of fighter engines planned for 1990's and beyond are expected to incorporate one or other variants of multifunction nozzles in place of simple axisymmetric nozzles employed hitherto. These advanced concept nozzle are required to have a continuously variable two-dimensional convergent-divergent configuration., capable of operating at maximum thrust efficiency at all conditions of engine operations. Besides, these nozzle configurations are required to permit thrust vectoring, thrust reversing and thrust monitoring at all. modes of aircraft operations such 'as take-off, landing and combat flight. Further, these I nozzles are required to be designed as an integral part of aircraft to fully exploit its multimode flight manoeuvring capabilities together with the low radar infrared signature, minimum drag and tolerable weight penalty. This document gives the details of a project proposed to investigate and evaluate various configurations of nozzles of interest to fighter engine/aircraft design

Calibration of Pitot -static probes for HAL Koraput

This document explains the calibration procedure adopted to test the pi tot-static probes, as required by HAL, Koraput . These probes (16 nos .) were calibrated in the 254 mm x 102 mm induction tunnel of the Aerodynamics Division of the laboratory . The probe calibration factors were determined and tabulated a s show

Calibration of fuel bulk meter hal overhaul division 1995

This document describes the, Calibration Tests carried out on the Fuel Bulmeter used in fueling in the overhaul division, HAL, Bangalore. Results of the calibration tests are tabulated and are shown graphicall

Calibration of pitot static probes for HAL- Bangalore

This document explains the calibration procedure adopted to test the pitot-static probes, as reqpired by HAL, B'lore . These probes (4 nos) were oalibrajed in the 254 nom x 102 mm induction tunnel of the Aerodynamics Division of the laborstort' The probe calibration factors were deteradned and tabulated as shown