Effects of intercooling and recuperation on turbofan engine performance
An overall performance simulation model of the intercooled recuperative aero-engine was built, and an overall performance simulation program was developed. Then, analysis of the effects of intercooling and recuperation on the thermodynamic cycle parameters and performance parameters of the turbofan engine can be carried out. The result indicates that the turbofan engine performance can be improved with the proper use of intercooling and recuperation. With the same thermodynamic cycle parameters, the thermal efficiency and the net thrust is larger, while the specific fuel consumption is lower. To gain the same performance, lower overall pressure ratio and lower bypass ratio can be chosen for the intercooled recuperative aero-engine.
ENVIRONMENT BENEFITS FROM PROPULSIVE TECHNOLOGY
The expected growth in air traffic stressed their relevance regarding the environmental impacts on the world stage. The aviation industry now has the challenge of reconciling the restrictive environmental requirements imposed by certificate authorities with the market desire for products with lower cost of acquisition and operation. The aim of this paper is to present the gains from technological development in propulsion to overcome this challenge. For this, bibliographic and documentary references related to the topic were used.
PRECISION FARMING APPROACHES TO SMALL-FARM AGRICULTRUE
Precision farming implies a management strategy to increase productivity and economic returns with a reduced impact on the environment. It is based on the application of information technology to a description of variability in the field, variable-rate operations and the decisionmaking system. There are three technology levels and three strategies in the development of precision farming. Precision farming practices can be used on small farms as well as big ones, and they play a core role in rural development programs which are integrated with industry. A real-time soil spectrophotometer was developed to describe soil variability in farmers' fields, to be used in precision farming.