RU2716064C1 - Method for determination of suitability of cruise missile start-up stages for long-term storage for further operation - Google Patents

Abstract

FIELD: weapons.

SUBSTANCE: invention relates to weapons and can be used in determination of suitability of cruise missile launching propulsion system for their post-warranty operation. In the given region, the problem is solved with reference to complexes of impact rocket weapon (cruise missiles) of the Navy. For the case, when powder charge of starting accelerating stage is subject to degradation related to its long-term storage. Materials presented in the present method contribute to solving an important scientific problem for the Navy - rational and safe use of ammunition for serial rockets of long storage life. Increase in efficiency of use of commercial fleets of serial rockets should be expected from functional-parametrical substantiation of information base for making decisions on prolongation of rocket weapon operation.

EFFECT: technical and economic effect of the proposed invention lies in the possibility of prolonging the operation of cruise missiles of long storage life and their further use during combat and practical rocket firing.

1 cl, 3 dwg

Description

A method for determining the suitability of launching booster stages of cruise missiles of long shelf life for further operation

The invention relates to the field of weapons, military equipment, complexes and systems for military purposes and can be used in the field of operation and restoration of weapons and military equipment.

At present, a variety of types of missile weapons of the Navy are in service at the arsenals, bases and warehouses of the Navy. The number of these missiles completely covers the need, which at first glance creates the impression of the predicted high efficiency of the functioning of the Navy's missile and artillery support system in terms of ammunition stockpiling for this nomenclature.

At the same time, the operational (storage) periods of most missiles exceeded the warranty, and for some they reach 35 years. It should also be noted that there are types of missiles, the life of which is completely exhausted.

The current situation requires an annual extension of the life of missiles.

This problem is not new, and every year the number of missiles requiring an extension of the operating life continues to grow. Today, there is a need to extend the life of missiles that entered service in 1998. This means that in less than 1 year the issue of extending the service life will arise with new-generation missiles (Caliber, Onyx, Uranus, etc.).

In this regard, the problem arises of assessing the state of the powder charges of propulsion systems and launch stages of missiles.

Nitroglycerin gunpowder is used in the launch stages of missiles.

During long-term storage, nitroglycerin gunpowder can spontaneously decompose and undergo various physicochemical transformations. These changes are possible as a result of physical processes - mass transfer (evaporation, moisture absorption), and physico-chemical processes (recrystallization, exudation), which affects the ballistic properties of gunpowder, which ultimately can change so that the practical use of missiles becomes inappropriate and dangerous.

In this regard, it is very important to be able to predict the shelf life of the powder for use (durability), during which the properties that ensure the tactical and technical characteristics of the weapon are preserved.

Thus, when deciding to extend the life of cruise missiles with long storage periods, it is necessary to take into account the degradation of the powder charges of their propulsion systems and launch stages.

In order to obtain data on determining the effect of the degradation of the powder charges of launching booster rockets (SRS) of cruise missiles, the task was set to carry out such an analysis without disassembling the launch engine and determine the physicochemical properties of the fuel by physicochemical methods. The basis for determining the effect of the shelf life on the possibility of further operation of serial Navy cruise missiles was fired bench tests (AIS), presented in figure 2.

For fire bench tests

The program and test procedure for each product, which consists of:

1. General Provisions.

2. The object of the test.

3. Terms and conditions of work.

3.1 General requirements for test conditions and support.

3.2 Conditions and procedure for work before the AIS.

3.3 Conditions and procedure for conducting the AIS.

4. Organization and logistics.

 5. Documentation and reporting.

6. Security requirements.

To solve this problem, theoretical experimental studies were carried out, which included the following main stages:

- a review and analysis of experimental research methods for changing the powder charges of nitroglycerin gunpowder CPC during the operation of missiles containing them;

- examination of the condition and preparation of missile launchers of missiles, the operation (storage) of which were in the range of 27-35 years, for testing;

- carrying out AIS using rockets of the selected year of manufacture determining the maximum and minimum pressure in the combustion chamber;

- fixation of control parameters and AIS results.

The tests involved starting booster stages (3L-45, 4L-44M1, 4L-80, 4L-86M), which are charges of nitroglycerin gunpowder stored in the range from 27 to 35 years.

The figure 1 shows a stand for conducting fire bench tests of the starting booster stages of cruise missiles.

Tests were conducted to determine:

- the state of the main powder charges stored for 30 years or more;

- comparison of the ballistic parameters of the powder charge of a long shelf life to a normal conditioned charge;

- compliance of the main flight characteristics of the Kyrgyz Republic with tabular values.

When carrying out such a test, the parameters necessary to achieve the goal of the study were chosen, namely:

 - year of issue of the Kyrgyz Republic;

- storage conditions of the Kyrgyz Republic;

- the maximum and minimum pressure values in the combustion chamber of the powder charge;

- the burning time of the powder charge.

The program of fire bench tests includes:

1. Starting acceleration of the stage of the Kyrgyz Republic, propulsion engines and marching engine.

2. Field tests in the Northern, Pacific or Black Sea fleets:

- restoration of technical readiness of KIPS;

- restoration of technical readiness of KASU carriers;

- preparation of telemetry measurements;

- preparation of the Kyrgyz Republic for full-scale tests, checking the status of the rocket safety circuits.

3. Telemetry measurements of practical launches of the Kyrgyz Republic in the Black Sea, Northern and Pacific Fleets.

4. Resource tests of the Kyrgyz Republic in the Black Sea Fleet.

The pressure at which the combustion process proceeds is the most important factor affecting the burning rate of solid fuels. For most fuels, an increase in the burning rate with increasing pressure is observed. This dependence is explained by an increase in the intensity of heat transfer to the fuel surface. The rate of reactions occurring in the condensed phase increases. At the same time, an increase in the concentration of gaseous reacting substances leads to an increase in the rate of exothermic reactions in the gas phase. The high-temperature zone of the flame approaches the surface of the solid fuel by reducing the gasification zone.

 A decrease in pressure has an inverse effect on the combustion mechanism — the influx of heat from the zone of flame reactions decreases, and the contribution of heat necessary to support combustion increases. At a certain minimum pressure, the flame zone disappears, reactions mainly proceed in the pre-flame "dark" zone. The burning process may stop.

The change in the burning rate of the powder charge due to changes in pressure and initial temperature refers to the case when there is no movement of combustion products along the combustion surface.

During the AIS process, the pressure in the product’s chamber P = f (τ) is measured during the entire operation time of the cruise missile launch unit, and pressure is recorded at the measuring complex.

The measurement results are processed on the measuring complex, a pressure graph in the product chamber P = f (τ) is built, and tables with the obtained data are compiled.

The figure 3 presents the dependence of the pressure in the combustion chamber on the time of combustion of the powder charge.

The working document reflecting the assessment of the technical condition of the launching unit of the cruise missile, the preparation and conduct of the AIS, and the defect is a technical act. The act shall indicate:

- test date;

- numbers of products and charges;

- initial weight data on the charge and product (extract from the form);

- information about the sensors;

- a description of the condition of the product after testing.

Attached to the act:

- protocol calibration sensors;

- product test report;

- atmospheric conditions.

 Thus, to achieve the intended results, the considered method includes the following actions:

1. Inspection and preparation of starting booster stages for testing.

2. Carrying out fire bench tests using missiles of the selected year of manufacture.

3. Determination of the maximum and minimum pressure in the combustion chamber.

4. Fixation of control parameters and results of fire bench tests of powder charges.

5. Comparison of the obtained parameters of the powder charge of a long shelf life with a normal conditioned charge.

6. Establishment of the life of the starting booster stages of cruise missiles of long shelf life.

The technical and economic effect of this invention involves increasing the combat readiness of the fleet forces and is crucial for planning the needs of the Navy.

A generalization of the results of firing bench tests and theoretical studies allowed us to develop a unified approach to determining changes in the basic flight characteristics of missile weapons.

Claims (1)

A method for determining the suitability of launching booster stages of cruise missiles of long shelf life for further operation, characterized in that a condition is examined and preparation of launch booster stages for testing, firing bench tests using missiles of the selected year of manufacture, determining the maximum and minimum pressure in the combustion chamber, fixing of control parameters and results of fire bench tests of powder charges, comparison of the received pairs ters propellant charge long shelf life normal conditionally charge, setting operation period.

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