Задание 1. Спишите текст и переведите его на русский язык.

Among the marine propulsion engines the steam turbines have proved highly efficient. More and more modern ships are equipped with steam turbines. The main propulsion machinery consists of boiler installation, turbine installation and propeller shaft. Modern turbine and boiler units are characterized by high steam pressure and temperature (40 ata, 450*C).

Main turbines, as a rule, develop about 8000 r.p.m. Control over combustion process and boiler feed operation of main turbines is automatic. Variably-pitch propellers are widely used in ships. Turbine machinery in the ship.

We'll try to show you construction of the turbine., their main parts, principle of operation. We start with "the location, arrangement of turbine machinery in the ship.

Certainly, it is located in the after part look on the engine - room arrangement. You see high - pressure (h.p.) low - pressure (l.p.) turbines and a condenser. The turbines are connected with reduction gear which supplies power to the propeller through the shaft. The boiler that supply steam for the turbines are placed above the condenser. The control room is surrounded by auxiliaries.

Steam turbines are classified as the main turbines, which ensure propulsion of the ship and auxiliary turbines, driving the pumps, fans, compressors etc.

As to the construction and principle of operation the turbines are impulse and reaction.

Дата добавления: 2015-07-20