Translating and annotating

Date: 2015-10-07; view: 569.

Quiz

Check you knowledge of aerodynamic forces affecting the aircraft and take the «Physics of flight» quiz on http://science.howstuffworks.com/transport/flight/modern/physics-of-flight-quiz.htm

Speaking:

You are a professor who is supposed to speak about one of the following topics:

• Aircraft pitch motion
• Aircraft yaw motion http://www.grc.nasa.gov/WWW/K-12/airplane/yaw.html
• Aircraft roll motion http://www.grc.nasa.gov/WWW/K-12/airplane/roll.html to a class of 3^rd year students. Prepare a lecture or a seminar explaining the topic to the class. Get ready to answer the questions. Prepare a Power Point Presentation to illustrate the basic items of your speech and to capture the attention of the audience.

2) Read the text «Gas Turbine Parts»:

Most modern passenger and military aircraft are powered by gas turbine engines, which are also called jet engines. Jet engines come in a variety of shapes and sizes but all jet engines have certain parts in common.

At the front of the engine, to the left, is the inlet. At the exit of the inlet is the compressor, which is colored cyan. The compressor is connected by a blue colored shaft to the turbine, which is colored magenta. The compressor and the turbine are composed of many rows of small airfoil shaped blades. Some rows are connected to the inner shaft and rotate at high speed, while other rows remain stationary. The rows that spin are called rotors and the fixed rows are called stators. The combination of the shaft, compressor and turbine is called the turbomachinery. Between the compressor and the turbine flow path is the combustion section or burner, which is colored red. This is where the fuel and the air are mixed and burned. The hot exhaust then passes through the turbine and out the nozzle. The nozzle performs two important tasks. The nozzle is shaped to accelerate the hot exhaust gas to produce thrust. And the nozzle sets the mass flow through the engine.

Here is a photo of a real, Pratt and Whitney F100 engine. The F100 engine is used in the F15 and F16 fighter aircraft. As we can see in the picture, jet engines are complicated pieces of machinery. Jets have a lot of parts which spin on a central shaft. To enclose the spinning parts, a jet engine is shaped like a long cylinder.

You can watch animated Gas Turbine parts on http://www.grc.nasa.gov/WWW/K-12/airplane/turbparts.html

Read this abstract about the structure of the turbo fan and fill in the gaps using the words from the box. Check yourself on http://www.youtube.com/watch?v=yo8e6L3JTMQ

The turbo fan which is the most common type of ­­­­­­­(1) _______________ operates by sucking in air using a large (2) _________________ mounted at its opening. This air is forced into the (3) ________________, a series of rotating blades which pressurize the air and force it into the gradual pan along the length of the engine (4) _________________. Hear the air is mixed with vaporized fuel and burned. The resulting (5)________________ which shoot out of the combustion chamber are used in two ways: some – in the turbine which powers the (6) ___________________. The rest shoot out of the engine through a (7) ­­­­­­­­­­­­­­­­_________________ which increases their pressure. This thrust propels the aircraft in accordance with (8) ___________________ that every action causes an equal and (9) ___________________ .

Speaking:

You are an engineer working for a big plant that assembles aircrafts. You are showing a non-specialist visitor around your company quarters explaining technical concepts and structure of the aircraft. You are in a gas turbine assembly department. In pairs, try to explain the work of the gas turbine and its parts.