IMPACT : International Journal of Research in Engineering & Technology

Number 6, 2013

1-14
Numerical Analysis of Aero-Spike Nozzle for Spike Length Optimization

Authors: Sanoob S N, Prince MG & Sundar B

Abstract

View in PDF

Number of views: 556

For future fully reusable SSTOs and rocket engines, light weight and high performance propulsion system from low altitude to high altitude are essential. Engines with aero spike nozzles are drawing attention as promising candidates which satisfy these requirements. A renewed interest into aerospike (plug) nozzles has surfaced for the possible replacement of standard contoured nozzles used for the propulsion systems of space vehicles. Although a more complex flow field develops on plug nozzles, the potential thrust and structural gains are attractive as the propulsive flow is free to adapt to the external stream. The commercial software Ansys-Fluent14.0 is used for the numerical simulation of the problem. Steady state analysis with implicit formulation is carried out. Mass, momentum and energy equations with k-e turbulence model is solved. In this project a study on various types of aero spike nozzles and characteristics of its flow field is carried out. Numerical analysis of a typical aero spike nozzle with results analysis and discussion on flow characteristics, comparison on full spike and truncated spike configuration for different pressure ratios are included. In truncated spike configuration, 20%,40%,60%,80% of spike length are included. The flow characteristics such as shock waves and wake formation etc are discussed with the help of contour plots. The performance analysis is done by plotting maximum Mach number, average exit velocity and thrust produced. Based on the analysis it can be state that the maximum performance is given by full spike nozzle. But we can provide truncation upto 60 % in order to reduce the weight and catastrophic failure due to high load on the surface.

15-22
An Approach to Store Spatial Big-Data Using Multi-Valued Database

Authors: Suchitra Reyya, T. Sumallika & G. V. M. Vasuki

Abstract

View in PDF

Number of views: 430

Spatial data has come to play an increasingly prominent role. Structured and unstructured data collected from diverse sources and used as an ensemble to derive information is referred to as Big Data. The size, variety, and update rate of mobility datasets exceed the capacity of commonly used spatial computing and spatial database technologies to learn, manage, and process the data with reasonable effort. Such data is known as Spatial Big Data (SBD). SBD has transformative potential. We formally define spatial big data preference queries and nested integrated inverted indexing technique (nI3). S2I index are an extension of the R-tree for efficient spatial search. As the data representing in the R-Tree, IR-Tree, S2I index, Integrated Inverted Index (I¬¬3) are in relation database (1st Normal Form), where this can occupy more storage space. To give an efficient reduction of storage space, we proposed nested relational database on integrated inverted index (nI3) to reduce the space complication and elimination of redundancy.

23-28
Real-Time Digital Simulation of Control System with LabVIEW Simulation Interface Toolkit and Simulation Module

Authors: U Solomon Raju & A Lakshmi Devi

Abstract

View in PDF

Number of views: 458

In this paper, the virtual instruments software Lab VIEW and its Simulation Interface Toolkit are introduced at first. With visualization technology, Lab VIEW can simulate an industry plant with better effect. The Lab VIEW Simulation Interface Toolkit (SIT) provides a seamless integration between MATLAB/ Simulink software and Lab VIEW. A method is presented to implement real-time digital simulation with no hardware-in-the-loop and a pure software real-time digital simulation example of a Performance comparision between Single loop and Cascade Control of Super Heated Steam Temperature System using analog Controllers using Lab VIEW Simulation Interface Toolkit is given. It can get better effect in teaching or training of industry process control system with minimal cost.

29-36
Towards Proposing a Novel Theoretical Technique for Traffic Monitoring over Fixed Monitors

Authors: P. Kiran Sree & P. Sowmya

Abstract

View in PDF

Number of views: 456

Monitoring the traffic encompasses traffic accounting, traffic shaping of network, operators employed in network, forensics involved and debugging. Most of the existing solutions only use better placement monitoring methods which are fixed in routing and routing traffic sub populations over existing monitors. This work proposes a novel technique for monitoring the network traffic flows. Traffic characteristics and measurement objectives are changing frequently. So, previous techniques for traffic monitoring become sub-optimal because of poor choice of monitors placement. To solve this problem we strategically routing traffic sub populations over fixed monitors. This approach is called measurouting. The main motive for MeasuRouting is effectively utilizing channel capacity or meeting quality-of-service constraints. It works within the constraints of existing intra domain traffic engineering operations. In this paper, we present a theoretical framework for MeasuRouting.