RU1802193C - Method for operating thermal engine - Google Patents

Abstract

Usage: engine building, in particular power plants and engines operating on hot gases. SUMMARY OF THE INVENTION: The method of operation includes compressing a gaseous working fluid, supplying heat at a constant pressure, expanding to a compression start pressure, and then cooling it by removing heat into the environment. The expansion of the working medium is carried out adiabatically, and the compression process is divided into two stages: isothermal and adiabatic, of which the isothermal stage is combined with the cooling process, which leads to an increase in efficiency. 3 ill.

Description

The invention relates to engine technology, in particular to methods for increasing efficiency.

The aim of the invention is to increase efficiency.

. In FIG. 1 shows a diagram of a piston-BOfo engine, with the help of which the inventive method is realized with isothermal compression combined with cooling of the working fluid; in FIG. 2 - view of the indicator diagram in PV coordinates; in FIG. 3 - in TS coordinates.

Engine 1 (Fig. 1) has one or multi-cylinder pistons 2, a crankshaft 3, drive valves 4, 5 and an air valve 6, a heater 7. The auxiliary engine 8 also has a piston 9, a crankshaft 10, between shafts 3, 10 there is an overdrive 11. A cooler 12 is located between the cylinders.

heat QI 13, heat removal to the environment 0.3 14.

In FIG. The following notation is adopted in Figs. 2 and 3: adiabatic compression cycle, admission of fuel heat at constant pressure QICZ, adiabatic expansion zb, isothermal compression with heat removal Oz Ba.

The calculated cylinder volumes due to the position of the piston are indicated: Vc is the volume of the compression (displacement) chamber, Vz

is the volume of the beginning of expansion, Va is the volume of the beginning of compression, Vb is the working volume of the cylinder (c, z, b, a also refer to temperatures and pressures at the corresponding points in the diagrams). .

The method provides for the conversion of heat in a closed cycle per revolution of the crankshaft (Fig. 1). Working body

- gas.

When the shaft 3 rotates, piston 2 moves from BDC to BDC, piston 9 moves from BDC to BDC, but with a larger speed than piston 2

00

about

Yu

u with

style. A working fluid with the temperature Th Ta flows from the cavity of the cylinder of the engine 1 through the refrigerator 12 into the cavity released by the piston 9, then back. Valve 5 is open, the rest are closed. At the moment the piston 2 is in position, when the volume above it is equal to Va (beginning of the second compression stage). Piston 9 should be back at TDC. Valve 5 closes. Through the refrigerator 12, Oz heat must be removed. The piston 9 is disconnected from the cylinder 1 and connected for collaboration to another cylinder. The piston 2 continues to compress the working fluid from pressure P8 to pressure Pc - PZ - maximum cycle pressure. With a volume above the 2-Vc piston, the working fluid is displaced through the valve 6 into the heater, and after the TDC, the working fluid again enters the cylinder through the valve 4 at the temperature Tg and pressure PZ. In this process, the heat of the SI fuel is supplied to the working fluid. Valve 4 closes when the volume above the piston is Vz (temperature Tg, pressure Pr). Expansion of the working fluid With the return of work is carried out to the BDC and

ends at a temperature Thb Ta and a pressure Pb Ra. This is followed by isothermal compression at T const with increasing pressure from Pb to Pa. Subsequently

cycles are repeated.

Thus, the claimed invention contains solutions that increase efficiency and bring it closer to the efficiency of the C. Cario cycle reference engine in thermodynamics.

Claims (1)

SUMMARY OF THE INVENTION A method of operating a heat engine, comprising compressing a gaseous working fluid, supplying heat at a constant pressure, expanding to a compression start pressure and then cooling it by removing heat into the environment, so that in order to increase the efficiency, expansion is carried out adiabatically, and the compression process is divided into two stages: isothermal and adiabatic, of which the isothermal stage is combined with the cooling process. FIG. / 0.2 u 0.6 0Ј i ytfrf FIG. 2.