This journal aims to cover the scientific research in a broader sense and not just publishing a niche area of research facilitating researchers from various verticals to publish their papers. It has provided an intellectual platform for the scholars, research students and academicians to share knowledge in the form innovative articles in all fields. The journal also aims to promote multidisciplinary knowledge and values for the development of society and extension of human knowledge. AJST is an International Multidisciplinary Research Journal devoted to publishing innovative thoughts and research paper on variety of topics related to:
E, Ibok Supervisor: The main objective was to investigate the effects of using hydrogen, kerosene and natural gas fuel on the performance characteristics such as net thrust, specific fuel consumption and propulsive efficiency of the turbofan. Another aim of this work was to introduce the concept of exergy and thermoeconomics analysis for twin spool mixed flow turbofan engine and show the components that contributes the most to the inefficiency of the engine.
A generic simulation was carried out using Gas Turb 11 software to obtain reasonable analysis results that were verified with a real-time JT8DA turbofan engine. The parametric analysis was done for constant value of mass flow rate of fuel and constant turbine inlet temperature for all three fuels.
The result were rightfully obtained for these analysis cases and discussed accordingly. Johnson Essien Ibok Supervisor: Dr Lionel Ganippa Title: This work focuses on the performance analysis of a twin spool mixed flow turbofan engine.
The main aim of this work is to conduct the parametric cycle simulation of a twin spool mixed flow turbofan engine and investigate the performance characteristics of it.
Another aim of this work is to show the effects of using hydrogen, Kerosene and natural gas fuel on the overall performance of the twin spool mixed flow turbofan engine.
This work is applicable in so many ways when it comes to the overall performance optimization and feasibility analysis of a jet engine. This work relates to the aerospace and aviation industries since the turbofan engine is amongst the vast number of jet engine used in propulsion of aircrafts.
There is increasing pressure in the aviation industry to reduce pollution and depletion of energy resources while at the same time maintaining reasonable investment cost and high overall performance.
Hence, this research was conducted in hopes of coming up with a new solution to this problem. The main conclusion drawn from the performance analysis is that hydrogen fuel produced the highest thrust level and the lowest specific fuel consumption between the three fuels for a constant mass flow rate of fuel.
Kerosene fuel generated thrust level can be increased if it is mixed with a small amount of hydrogen. The Exit jet velocity ratio remained constant despite the increasing bypass ratio for all three fuels at constant mass flow rate of fuel. Using the exergetic analysis showed that the combustion chamber and the mixer contributed the most to the inefficiency of the turbofan engine.
The amount of exergy transferred into the turbofan engine by hydrogen was depleted in the smallest ratio compared to natural gas and kerosene for constant mass flow rate of fuel. The thermoeconomics analysis showed that it is preferable to use local based cost evaluation to quantity specific thermoeconomics cost of thrust than the global method since the value was lower.
The results obtained from the simulation using Gas Turb 11 produced an error range of 0.
The results obtained for the analysis defined a reference design point at which the parametric analysis was conducted on. The analysis was done in three cases as shown clearly in the test matrix in table 1 below.
The exergy analysis was done for the parametric analysis of case 2 and case 3 where the exergy destruction rates, exergetic efficiency, exergy improvement potential rate and fuel depletion ratio were calculated.
The distribution of these results throughout each component of the turbofan engine was represented with bar charts and Grassmann diagram. The thermoeconomics analysis was conducted for analysis case 2 using kerosene fuel.
The specific thermoeconomics cost of thrust was calculated using global and local based cost evaluation methods. I am deeply thankful to my supervisor, Dr Lionel Ganippa for believing in me and giving me the opportunity to work with him in this field of study. I am also thankful to him for giving the necessary guidance and advice and his enthusiasm and innovative ideas inspired me.Examples of foundation design and dynamic analysis.
Top left: compressor, skid and foundation design provides an integrated approach and reliable results.
A Comparative Study on the Thermodynamic Analysis and Performance Characteristics of a Dedicated EGR Gasoline Engine Under Various D-lambda The concept of D-EGR (Dedicated EGR) used high EGR rate and fuel reformation to improve thermal efficiency, entire exhaust gas which supplied from a single cylinder is recirculated to the intake system and then entered into all cylinders to . Aluminium hybrid composites are a new generation of metal matrix composites that have the potentials of satisfying the recent demands of advanced engineering applications. considerations have clarified scramjet and ramjet operation, performance, and characteristics. Second-law based analysis is extended specifically in this work to clarify and describe the performance characteristics for dual-mode scramjet operation in the mid-speed range of flight Mach 4 to 7.
Top right: concrete foundation dynamics. Bottom pictures illustrate pile foundation design and dynamic analysis..
2 BETA Advantages. BETA’s expertise in machinery design and dynamics, combined with in-house experts is unique. Mechanical Analysis Frequency Avoidance. The first step in a mechanical analysis is to determine the Mechanical Natural Frequencies (MNFs) in the system, identify where and when resonance may occur, and provide recommendations to improve the design.
THERMODYNAMIC ANALYSIS FOR IMPROVEMENT IN THERMAL Nishida et al. 7 have analyzed the performance characteristics of two configuration of regenerative steam-injection gas turbine (RSTIG) systems. performance analysis has been carried out by varying ambient temperature, humidity ratio and steam injection.
considerations have clarified scramjet and ramjet operation, performance, and characteristics. Second-law based analysis is extended specifically in this work to clarify and describe the performance characteristics for dual-mode scramjet operation in the mid-speed range of flight Mach 4 to 7.
The effect of the geometrical characteristics of the regenerator on power output and engine performance was examined based on the results of a simulation analysis. Aluminium hybrid composites are a new generation of metal matrix composites that have the potentials of satisfying the recent demands of advanced engineering applications.