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Nageswara Rao, B.
- Performance of Cooling Hot Gas Discharge Spray Cooler with Flow Parameters Variation
Abstract Views :392 |
PDF Views:140
Authors
Affiliations
1 State Board of Technical Education and Training, AP, Hyderabad-500063, IN
2 Department of Mechanical Engineering, JNTUH, Hyderabad-500085, IN
1 State Board of Technical Education and Training, AP, Hyderabad-500063, IN
2 Department of Mechanical Engineering, JNTUH, Hyderabad-500085, IN
Source
Indian Journal of Science and Technology, Vol 5, No 5 (2012), Pagination: 2762-2764Abstract
Rockets with combustion chamber would reach 3500K to 3700K. For efficiency reasons and safe design of ejectors, after-cooler is interposed between the diffuser and ejector. This process is also operated at fairly high pressure 10 to 200 bar. Due to high temperature and pressure, thermal shocks generated are prevented by spraying water particles uniformly inside the gas cooler. In this paper, the significance of water spray characteristics is studied thoroughly. The water droplet evaporated into a flow of exhaust gases with a droplet size of 15 microns diameter increases the total surface area and is about 400 m2. The spray cooler length is suggested as 7-9 m to reduce the component of unevaporated water for optimum mass flow rate of primary fluid. Water injection velocity and pressure are varied as using number of nozzles. The injection pressure is reduced 10 times (2.0 - 2.5 bar) by increasing the number of nozzles (about 2000) in quadruple.Keywords
Combustion Chamber, Rocket, Injection Pressure, Water SprayFull Text
References
- Goethert BM (1962) High altitude and space simulation testing. ARS J. 32, 872-882.
- IS Habib (1973) The rapid cooling of a hot gas discharge by liquid sprays. J.Appl. Sci. Res. 28,62-72.
- Manikanda Kumaran R, Balasubramanian S, Kumaresan K, Raja manohar D, Rajarathnam SM and Sundararajan T (2008) Performance characteristics of a gas cooler in a high altitude test facility. Proc. Int. Conf. on Aerospace Sci. & Technol., 26-28 June 2008 , Bangalore, India.
- Quinn B (1976) Ejector performance at high temperatures and pressures. J. Aircraft.13, 948-954.
- Sankaran S, Satyanarayana TNV, Annamalai K, Vishwanathan K, Babu V & Sundarrajan T (2002) CFD analysis for simulated altitude testing of rocket motors. Can. Aero. Space J. 48,153-161.
- Stephens SE, Bates LB and Lacasee JEP (1991) Geometry effects in second throat annular steam ejectors. Joint Propulsion Conf., Sacramento, CA AIAA Paper-2271.
- Xu D, Khoo BC and Leschziner MA (1988) Numerical sSimulation of turbulent flow in an axi-symmetric diffuser with a curved surface center-body. Int. J. Numerical Methods for Heat & Fluid Flow. 8,245-255.
- Study on Finite Element Modeling Aspects of Delaminated Honeycomb Sandwich Beams
Abstract Views :199 |
PDF Views:2
Authors
Affiliations
1 Structural Engineering Entity, Vikram Sarabhai Space Centre, Trivandrum, IN
2 Applied Mechanics Department, Indian Institute of Technology, Chennai, IN
3 Mechanical Engineering Department, Indian Institute of Technology, Chennai, IN
1 Structural Engineering Entity, Vikram Sarabhai Space Centre, Trivandrum, IN
2 Applied Mechanics Department, Indian Institute of Technology, Chennai, IN
3 Mechanical Engineering Department, Indian Institute of Technology, Chennai, IN
Source
International Journal of Vehicle Structures and Systems, Vol 4, No 3 (2012), Pagination: 113-117Abstract
The simulation of damaged honeycomb sandwich structures is an important aspect in the structural health monitoring and prognosis. This paper studies finite element modeling aspects of delaminated honeycomb sandwich structure. The models proposed are 3-D model of the honeycomb sandwich construction using isotropic shell elements and a layered shell element model, both with contact elements defined in between the delaminated skin and core. Case study is conducted on damaged and undamaged metallic sandwich beam with 3-D shell element modeling and layered element modelling. The models are validated using three point bending test of damaged and undamaged beams. Results are compared with the experimental, theoretical and finite element results. The results show that the layered element modeling simulates the stiffness and gives the similar results to that of 3D model in the global responses and is computationally efficient.Keywords
Honeycomb Sandwich Structure, Delamination, Finite Element Modelling, Three Point Bending Test.
- Probabilistic Settlement Analysis of Rafts Using First Order Reliability Method
Abstract Views :187 |
PDF Views:132
Authors
Affiliations
1 Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, IN
1 Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 1-7Abstract
Settlement of foundations is of crucial concern as it affects the strength and durability of the superstructure as well as the foundation itself. Traditional settlement analysis methodologies cease to incorporate uncertainties associated with design parameters of the foundation. Probability-based settlement analysis of raft foundations accounting for the uncertainties in design variables is presented in this paper. Probabilistic soil-structure interaction model of the raft is developed duly considering the variability involved in various design parameters. The first order reliability method (FORM) is used to evaluate the probability of failure and reliability index associated with the settlement of the raft foundations. Parametric sensitivity analysis is also carried out to identify the important design variables that affect the performance of the raft foundation in connection with the settlement limit state. The reliability analysis of the raft employing the finite element method is also presented.Keywords
Raft Foundation, Soil-Structure Interaction, Uncertainties, FORM, Probability of Failure, Reliability Index.Full Text